Malicious PDF — malware analysis report

Static analysis result for SHA-256 428d46d3c2667339…

MALICIOUS

PDF

42.3 KB Created: 2020-08-06 12:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26dc994432968b8ef146dc961a7f3370 SHA-1: 8f745b59676822e2ca14255e7af0d26930895b72 SHA-256: 428d46d3c2667339cc7fa167980751fa5cb1ec08047682b3becdcd4d5fa22703
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious due to a high ML score and the presence of numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=textbook+of+biochemistry+for+medical+students+pdf+download'. The document also functions as a link farm, embedding a large number of external PDF links, many of which point to Shopify domains, likely to appear legitimate. No scripts were extracted from this sample.

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=textbook+of+biochemistry+for+medical+students+pdf+download
    • http://files.hemporiumbeads.com/uploads/1/3/2/6/132682093/7327596.pdf
    • http://jewad.yourownpathyoga.com/uploads/1/3/0/9/130968921/lejij.pdf
    • http://komewep.alittlearttherapy.com/uploads/1/3/0/9/130969368/poxinusoredon.pdf
    • http://files.chickhillguideservice.com/uploads/1/3/0/7/130739658/pijajulikugisob_mubaxupakew_saguwizala_dizof.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/jipuguxogikiluzugidob.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/wave_equation_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5379/files/bias_variance_decomposition.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6833/files/argumentative_speech_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/namafasuxijegidodugugan.pdf
    • https://cdn.shopify.com/s/files/1/0440/1129/0782/files/30459187582.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/53611944350.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/time_servers_address.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/blender_3d_animation_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/55852591956.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/86558851590.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/divewakisepem.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644b.bin
d7ef921d8b37c35bd35427557355f510cdecb3264f8d35264985ed4766c78b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 5808 bytes
font_01_sfnt_off00007801.bin
5cf756b7dccf7f92186bbb04828f3df0954237f96af62633305dbf98d88d82e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 10528 bytes

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