Malicious PDF — malware analysis report

Static analysis result for SHA-256 015dbc9e3d32b162…

MALICIOUS

PDF

48.7 KB Created: 2020-08-25 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52313fb79165ccf47710c474dec921f9 SHA-1: 999c83a94b4794ed2f9c4293ba48a9ec4e3c321b SHA-256: 015dbc9e3d32b162b20c23bd5d50eaeea20b1b0edc6b11a1588d7b4c197ba542
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to the presence of numerous embedded links, including a critical redirector link to ttraff.com. The document body, though heavily obfuscated, contains references to this malicious URL and a large number of other PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also 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.com/pify?keyword=acidophilus-+pectin+citrus+davis+drug+guide
    • http://luxov.bobvanbreda.com/uploads/1/3/2/8/132816202/kigojodip_lizatubofozawev.pdf
    • http://files.njab.org/uploads/1/3/1/3/131380777/xadavajel_fupaxobesamakap_levosulek_bimigukaxawi.pdf
    • http://nesezum.storyshack.org/uploads/1/3/0/8/130873995/fufogumanofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/29718682790.pdf
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/ejercicios_frutas_y_verduras_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/ib_french_ab_initio_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/cardi_b_bodak_yellow_lyrics_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/liwut.pdf
    • https://cdn.shopify.com/s/files/1/0434/2982/2631/files/gta_save_editor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/path_of_exile_cruel_labyrinth_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/tupazenulepojidapozowafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/xazebujutegetediz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007132.bin
3e03b6c553bcc2cb9f5e2ca459958d561032eed8f140990ad471b2cd7acb2c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 5300 bytes
font_01_sfnt_off0000832a.bin
fbb0eff241407cc3b095b1ace995277532aef3eed76926560d77b09729a9102a
pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 10732 bytes
font_02_sfnt_off0000a7d9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D9 4324 bytes