Malicious PDF — malware analysis report

Static analysis result for SHA-256 73867b5320c2a81f…

MALICIOUS

PDF

33.8 KB Created: 2020-08-29 17:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c4a8a75c13b64e7e61748008f3d955c SHA-1: 1311c69cd071f77dd24b9d3efa401febc8880927 SHA-256: 73867b5320c2a81f44fab379beab4ee0adf3b4324cba033b37f0ee5e3602b6a6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=zadarmo+readiris+pro+12+na+stiahnuti'. The document body, though heavily obfuscated, also contains this URL, indicating its likely purpose is to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malware distribution attempt.

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/wix?keyword=zadarmo+readiris+pro+12+na+stiahnuti
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6019/1651/files/legibinivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/electroencephalography_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/imperialismo_economico.pdf
    • https://cdn.shopify.com/s/files/1/0437/3335/2609/files/cayucos_surf_report_magic_seaweed.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/gawawozijex.pdf
    • https://static.usrfiles.com/ugd/b8c837_267c64cb94ed4212abc2beb0b1fef955.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/zijeduseruxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/pemomatozofu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0729/files/nebisamabemewose.pdf
    • https://cdn.shopify.com/s/files/1/0450/1169/7814/files/sat_math_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/6th_grade_social_studies_lesson_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/zijekov.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/6093250443.pdf
    • https://cdn.shopify.com/s/files/1/0429/7320/0537/files/gelevogiboweniz.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_off000045a1.bin
959a041ae241b2b5f5ea419c42823ab9e23d898ddc66c482df2a17ca24324fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45A1 5308 bytes
font_01_sfnt_off00005789.bin
0047f3a33f65547802dac0c8dc36815ee4808b88a01db72b75e4182beb046cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5789 10228 bytes

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