Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b249813adfdeb0…

MALICIOUS

PDF

52.0 KB Created: 2020-08-07 08:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77cb8d527433ba8177dc2c53479ecef SHA-1: 7a0857c347719ed4225af4a0dc9262432b533a6e SHA-256: 84b249813adfdeb03fed84cf882e0c2675842bd1291c94c67f45a5feaa712eb1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link, 'https://ttraff.ru/pify?keyword=accuracy+and+precision+in+physics+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF links, likely to disguise the malicious intent.

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=accuracy+and+precision+in+physics+pdf
    • http://files.andersoncapsim.com/uploads/1/3/1/4/131437378/7807478.pdf
    • http://files.trumbullpolicecadets.com/uploads/1/3/1/4/131438397/lawibegubebiganukivo.pdf
    • http://files.americancollegeofspinesurgery.org/uploads/1/3/0/9/130968947/4980196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/17825683295.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/favonarudamesulijow.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/19140865909.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/appcelerator_titanium_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/74769064443.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/jiwimuzuguwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/nj_civil_service_exam_2016.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/5825974040.pdf
    • https://cdn.shopify.com/s/files/1/0434/4224/1688/files/54186246255.pdf
    • https://cdn.shopify.com/s/files/1/0438/6524/3813/files/54196262465.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/74495492359.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_off00007fc5.bin
1165e47cd9a25c1c58474e72d57f09c608fec47ab561212e559566bde608bb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 5104 bytes
font_01_sfnt_off00009119.bin
a54bfd6aa27c19d31b26d1b532cc89b5f2c1f398ed24c5e653d5e8f2ca57cba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9119 10656 bytes
font_02_sfnt_off0000b4bf.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 4324 bytes

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