Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039475e1e506a25…

MALICIOUS

PDF

79.5 KB Created: 2020-08-06 11:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f591af7783f41c19d346e70e10284cac SHA-1: 868e7c949c7b01a5cc86f9b47424e84a871606c9 SHA-256: 1039475e1e506a25aa065959df2a6a9d88071de88f3fb70d50b120ac20a66117
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a link to a calculus PDF. The document also contains a large number of links to external PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates 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.cc/pify?keyword=differential+calculus+made+easy+pdf
    • http://files.fcwomenandfamilyshelter.org/uploads/1/3/1/4/131406082/zilaza.pdf
    • http://files.apeacefulbirthdoula.com/uploads/1/3/0/9/130969440/5828cbf8.pdf
    • http://files.paintthetv.com/uploads/1/3/0/8/130874254/jujur.pdf
    • http://files.eceaministries.org/uploads/1/3/0/7/130775372/fbf32e0.pdf
    • http://gexabi.greatdunham.org.uk/uploads/1/3/0/7/130776257/zelojuvo_basaliso_gajajugedonize_rerazewomijuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/7450640186.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/93359771439.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/desot.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/algebra_eoc_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/dutudib.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/sazove.pdf
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/napulewofopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/wuxakenunoxusisafojizif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/91404925031.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/star_wars_ahsoka_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/xabujivukiv.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_off0000e2d8.bin
6ab22e2904fa38ab89033e12cc0f10bf8b5fcbcc0796ab3ff3bfa6584f4984dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 5176 bytes
font_01_sfnt_off0000f461.bin
ccf68d46cbe2f84b8582d0f358a4f85f4611d10256b0cd493f09acba0099744c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 14752 bytes
font_02_sfnt_off0001227a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 4324 bytes

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