Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b418d5df52f8e2…

MALICIOUS

PDF

57.2 KB Created: 2020-08-25 23:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2217be321961928fc39170032ac4b7b8 SHA-1: 54af1017c26e5bfa2e5711d2e4b3013e727b0b23 SHA-256: 12b418d5df52f8e2f6ed371aa2554e6c1a92810ff9a19404e2783c9ab4322df3
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=t%25C3%25BA+me+quieres+blanca'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which point to potentially untrusted domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via the embedded redirector.

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.ru/pify?keyword=t%25C3%25BA+me+quieres+blanca
    • http://sojuvob.capitolcom.com/uploads/1/3/2/6/132695675/f7de31c7ead7580.pdf
    • http://files.epictherapyandwellness.com/uploads/1/3/0/7/130738892/7110317.pdf
    • http://files.rowancountychristmas.org/uploads/1/3/0/8/130814706/7551291.pdf
    • http://xekez.idahonordic.com/uploads/1/3/1/4/131454029/nakuxu-dumegek.pdf
    • http://joxifijof.thewomenslockerroomfoundation.org/uploads/1/3/0/7/130775413/sebatude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8241/4248/files/biological_food_hazards.pdf
    • https://cdn.shopify.com/s/files/1/0454/0062/1224/files/astrology_app_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zajube.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/57893259863.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/48771364784.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/demon_hunter_i_will_fail_you.pdf
    • https://cdn.shopify.com/s/files/1/0444/3154/0391/files/algorithm_analysis_and_design_notes.pdf
    • https://cdn.shopify.com/s/files/1/0457/0805/0588/files/37161499128.pdf
    • https://cdn.shopify.com/s/files/1/0433/4000/5541/files/pathophysiology_of_cardiogenic_shock.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.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_off00009ec3.bin
cba45eb4a2e4ac4e734585c2f08a4d112f95d8a547b6d013f130136702e78806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC3 5276 bytes
font_01_sfnt_off0000b059.bin
57c0c3a2843820937f0d9e905cc98281ffb2b46eb779711b4c08cf3329c0be5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 11460 bytes

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