Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fa2415060efe85…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 21:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d89c50378cf5c6e376e4cd7e6b83dca SHA-1: 26f10de571bd87aeba967d60ef313cb337e725f8 SHA-256: 84fa2415060efe859277ade459be7bab2e343adf695f680da6b5bc0514814f55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to lure users to malicious infrastructure. 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.cc/wix?keyword=feral+dps+guide+vanilla
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/14446112141.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/30491988086.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/aretha_franklin_funeral_program_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/new_amharic_bible.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0433/6068/2139/files/soccer_livescore_android_app.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/army_ranger_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/befajazuzofegide.pdf
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/chunkzz_songs_wapmallu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5233/3206/files/vetipukusuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/38763004097.pdf
    • https://cdn.shopify.com/s/files/1/0432/5802/0004/files/triangle_law_of_vector_addition_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9427/files/88105624440.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/37078880240.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/1555779332.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_off0000638f.bin
d4f0e4faf73e030e68f59d09d8212ab77f735c08ae5b1d74521ed970513bde0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638F 4832 bytes
font_01_sfnt_off000073fc.bin
886d9c178a0f6ab52fb4f8401df827aaa862593c98e632313a8e44982e023f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 10064 bytes
font_02_sfnt_off0000966c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966C 4324 bytes

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