Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d1cb5db4271b89…

MALICIOUS

PDF

43.0 KB Created: 2020-08-08 13:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69f3cc7274032fd4b2385fe12dbda3b4 SHA-1: f6fcc13c4748b4f3f34f31ed6bdb4b15c78b3586 SHA-256: 79d1cb5db4271b8938770556f697aa51550bdfa4008089110523ca178b8fab6a
154 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 external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, https://ttraff.cc/pify?keyword=marital+counselling+techniques+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier also 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=marital+counselling+techniques+pdf
    • http://files.robynabramsmosaics.com/uploads/1/3/2/6/132695633/ludig.pdf
    • http://gagafon.liquidlightbodyworks.com/uploads/1/3/1/3/131398020/gimem.pdf
    • http://wogov.midcoteaparty.com/uploads/1/3/1/3/131379578/wujex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/28998518717.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0440/6948/6757/files/42501214402.pdf
    • https://cdn.shopify.com/s/files/1/0439/3431/8760/files/47179918840.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/lt_grade_biology_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/lororu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/luluvidoretaseferawewub.pdf
    • https://cdn.shopify.com/s/files/1/0440/5071/0693/files/lewodagozeneginaruw.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/mcmurry_fay_chemistry_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/viwabifiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3548/3551/files/defying_gravity_glee_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/ziratuletizadapiluli.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/west_bengal_apartment_ownership_act.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/rakamejafutaxilitinati.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a9.bin
7a5d691940c32b007772dddf43b91fc0bc3558df24de83e938b3b134aa0ba567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A9 5548 bytes
font_01_sfnt_off00007c7d.bin
22856875d0ca9257831b677ca24463fb44c2f642f2f30327ed2f76dc85446de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7D 10156 bytes

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