Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdbb4e84f840fb8…

MALICIOUS

PDF

48.7 KB Created: 2020-07-31 14:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d5b90df4ef867a2c7f2c7934519c077 SHA-1: 82b3b66f1e819bcad67970d088a9d7d40cb651d8 SHA-256: 0cdbb4e84f840fb87da41bdb6ce76f59207c80290c675f63789e0b81d5fbd83b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to 'Bronchial asthma causes pdf', suggesting a lure for search engine optimization. The presence of multiple links to external PDF files, many hosted on Shopify, indicates a link farm strategy, likely to distribute further malicious content or engage in SEO manipulation.

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=bronchial+asthma+causes+pdf
    • http://files.artfullyfrosted.com/uploads/1/3/0/8/130873987/bb133b0698f21.pdf
    • http://files.bayadapediadtricswlm.com/uploads/1/3/1/3/131383045/voxivu-kuzetofedoduwi-xavazimoni.pdf
    • http://files.praxsym.com/uploads/1/3/0/7/130739369/7658774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/jasivuzita.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/kurowejalukevixedivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/belosufopolivegowefeselo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/75567085880.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/balep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0286/files/57700851715.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/69022213788.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8772/files/xulelepuxosajulotugime.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/31908096085.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/51109962722.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/dovamegeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5920/8604/files/javorod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.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_off000081c0.bin
0f532693f2cd53eb918d9cbc6f4a05a41a87ddc90692cd6f9d1095fb88c1ae51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 5324 bytes
font_01_sfnt_off0000939d.bin
6bae567c4a504573e938a75aa484792d8f9c9a84594da5ea5663d1e9f42c211b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939D 9968 bytes

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