Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4d118d8ff1c967…

MALICIOUS

PDF

43.9 KB Created: 2020-08-03 09:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e8857a103e5af19a26ebb5cca7967f SHA-1: f9419b29192472d841b8a5ed7f4ba1a7ceb97331 SHA-256: 0a4d118d8ff1c967af95ffc0c80268b475df78fa9cb0034264d3da85e0278b70
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, suggesting a phishing or scam attempt. The embedded URLs and the document body text, which includes a search query for a textbook PDF, indicate a lure for users seeking free content. The ML classifier strongly flagged this PDF as malicious.

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=general+chemistry+4th+edition+mcquarrie+pdf
    • http://files.napaneefamilyeyecare.ca/uploads/1/3/0/9/130969036/afd370b96f.pdf
    • http://files.pvpto.com/uploads/1/3/1/0/131070116/6820102.pdf
    • http://files.kdasc.org/uploads/1/3/2/7/132740711/ruvekibexosiva.pdf
    • http://files.keithleykustomz.com/uploads/1/3/0/7/130776749/mororusoxi_sofodajiturafi_nomimeta_pitajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/nosimabiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/bruno_stair_lift_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/xumisurisomizivureke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/fejafavosimoro.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/5674235496.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/11594562054.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/27924700503.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/income_tax_rates_2020_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/61782602075.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/paxapik.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_off00005c3c.bin
476da896c06b262d4f49d33bada49f72329d3aac9d64cf0b1d39e1d22dba8424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3C 5624 bytes
font_01_sfnt_off00006f35.bin
6af62262ea9a41fa8acaad0dccb61613db37f79c30b09e7cc0ce1d8516c9e6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 10344 bytes
font_02_sfnt_off0000927a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927A 4324 bytes

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