Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d2b4c4845fea38…

MALICIOUS

PDF

69.0 KB Created: 2020-10-17 18:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef363c5bdfed4f070b8edc7dc2410a0f SHA-1: a868bdfbe15047ef81f984e8fd733a2a5e9fab84 SHA-256: 70d2b4c4845fea388e240d13365ebd52256d54138e33c58df4a01c826696f41c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for free downloads, which is a common tactic for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/123?keyword=bethala+kathalu+in+telugu+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f87155fc62eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f897e7d72056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f87fdca1ebc5.pdfIn PDF document text
    • https://nasinapalu.weebly.com/uploads/1/3/0/7/130739684/6025596.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/4883934.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/zewupewif_jokorixegemoke_rafarupedojanov.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/mowofotelebi.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/8562847.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/xazatox.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/zizikiki.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/sasimusinomojiput.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/bikopawefajiworurego.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidobojugonuxexoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f88be5748db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f88da6181dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f8a86b629a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f8ac5c25abc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8529/2225/files/gefafuwedetamuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/somatic_cells_vs_gametes_chromosomes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4D 7608 bytes
SHA-256: c0fcc41018fb83f0b45b3f5a55f777522ef4dd2e7cd5b68d0eaa66f41ab9bc19
font_01_sfnt_off00008665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8665 5212 bytes
SHA-256: 0a056be6caf38a4ab09a1ca859e3ce9138412f05ff05fb430f2b46d19f1a7725
font_02_sfnt_off00009824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9824 27268 bytes
SHA-256: e644e4761e8fb17e33810820695ffcb4ff836a9b4c03466a47f375fd331a36a1
font_03_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10396 bytes
SHA-256: 303e0f1241d783c8a78e8b6fcb01b979a512e8b8c3bac7c5a2fcb993b627aadc
font_04_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f