Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c170f040c0727b…

MALICIOUS

PDF

44.5 KB Created: 2020-07-10 21:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b46f847f52b28d81845cba1ba744f1 SHA-1: 7addd42845316f7436c47c98b20c3cc93088349f SHA-256: e3c170f040c0727b36cffa4aadad8561b4c43607c8d8649be82b75895bd826ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=warriors%20schedule%20pdf'. The document body, though partially corrupted, also contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of 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/wb?keyword=warriors%20schedule%20pdf
    • http://files.naturaphysicaltherapy.com/uploads/1/3/0/7/130774990/55ffc5057.pdf
    • http://files.marquetteviscomm.com/uploads/1/3/2/7/132741433/jatevunuxod_jejosufasiwe.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://files.daughtersofscotia.org/uploads/1/3/1/4/131438499/6c7fd9fd.pdf
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdf
    • http://files.nadinemanion.com/uploads/1/3/1/0/131070506/gixororapakebab.pdf
    • http://files.laughingbuckfarm.com/uploads/1/3/1/4/131438002/surenu.pdf
    • http://files.eliseblackwrites.com/uploads/1/3/0/7/130776104/mibotawodija.pdf
    • https://fowemagafob.files.wordpress.com/2020/07/50679975944.pdf
    • https://dokowigi.files.wordpress.com/2020/06/ruwerubovarekolitida.pdf
    • https://gigepopigep.files.wordpress.com/2020/06/lituwati.pdf
    • https://zadejexidaba.files.wordpress.com/2020/06/fejafedolutuliz.pdf
    • https://xoxapuziri.files.wordpress.com/2020/06/22895741699.pdf
    • https://bozidaza.files.wordpress.com/2020/06/62069910290.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78682713185.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88065476392.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30036161276.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_off000070b1.bin
e451e3a1e9521bdff5b0f4c9eb8709d099333d7491302b8da61755a34e591bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 4952 bytes
font_01_sfnt_off0000819e.bin
a3638b5e2d984bb31e44c324d495e06fc06a9e4d6f89c1a912d078b0532c51df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 10400 bytes

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