Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec31efb868d188…

MALICIOUS

PDF

48.7 KB Created: 2020-10-25 18:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5737ccf390821b40f78736513f1d3fd SHA-1: db547b3288023a1f6d0be074a97dbf6403c83777 SHA-256: dcec31efb868d188f14e65861c9bfb9a0870ebb12da764652efa12dac4d80b10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a mass of external links, including one to a known malicious redirector. The document body text, though garbled, references "Loader droid pro apk 1.3" and includes the malicious URL, suggesting a lure to download potentially unwanted or malicious software. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=loader+droid+pro+apk+1.3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f91c7d18b08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f8961db0c0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f9585fa22aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f876ba0b35d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f8869678d909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f920616e784b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f89577be244f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8d5311981ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_5f8f2a699f506.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/puweweni.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/7007994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/kewudotewuvuxibebewev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2072/8478/files/3885854860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9191/3632/files/pabebukujawini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0030/6111/files/k-means_clustering_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4002/8837/files/drake_roblox_id_code_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/anonyme_alkoholiker_12_schritte.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/wuvega.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/burial_rites_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/auditing_assurance_services_a_systematic_approach_11th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 3488 bytes
SHA-256: fe13d085b3d06eab62e52db8e24fdd83a2c4569fae301272e0c5fe06e4fe2786
font_01_sfnt_off00007770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7770 4996 bytes
SHA-256: 50d501796bd6ab71dd374ec5dfa6ce072a8652261f078c1b1561c8e1bc4eece7
font_02_sfnt_off00008891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8891 13056 bytes
SHA-256: e1bf1fad3139dd3dbc136ee6cdcb660cd5b86d159002e051486046e723f90e95

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