Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e19bbc199156a8a…

MALICIOUS

PDF

37.2 KB Created: 2020-08-22 23:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a7c24edb794e2b82ce0666b58036d71 SHA-1: 804ea63b64d1e69c4d891ea890f76666fff0e2d8 SHA-256: 8e19bbc199156a8a4cc6ad464b66d41d82e3c7ad96080a2ff680afeb6e1d185c
152 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, ttraff.ru, which is disguised as a homework answer key. The document also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of the redirector confirms a malicious intent to lead the user to harmful content.

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=weekly+math+homework+answer+key+6th+grade
    • http://nidovit.thetravellingsingh.com/uploads/1/3/0/8/130814297/nutefig-wixadoxemamuwe.pdf
    • http://files.malcolmdeweyfineart.com/uploads/1/3/1/6/131636954/zivovasumutom.pdf
    • http://files.joxytales.com/uploads/1/3/0/8/130874403/6826423.pdf
    • http://bltlly.com/15math
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/boxosarupogife.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/nasisupixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/10402564799.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/xenukifarevig.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/fugudizomog.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/64434424930.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/lofefevebegupidokigez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/canonical_format_example.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/pejomapesizupaduduvoso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/77577051371.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/mtg_card_price_tracker.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/26305977744.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/word_pairs_exercises_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/47709583074.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_off000051c3.bin
880fe5759936d6f8cd8aaab1f3b800909b046dcbf636724515c2f3069b773ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C3 5664 bytes
font_01_sfnt_off00006509.bin
2ab03a5a1fef17e673deda0e4ef9e20697d44bf798a556ea87f935395649f974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6509 10092 bytes

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