Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f342ba894eeaac7…

MALICIOUS

PDF

38.5 KB Created: 2020-08-01 17:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e4eda70aa1eb11678c80d89169ed8c SHA-1: 31d93e0d66a890fc17be62236024bc1193ed2a88 SHA-256: 8f342ba894eeaac7961169c4b1dccd0eb737bc3b27a7502b1a78ad799ffeebf3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=lyman+reloading+manual+50th+edition+pdf'. This indicates the document is designed to redirect users to potentially harmful content. Additionally, a large number of external PDF links were found, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious.

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=lyman+reloading+manual+50th+edition+pdf
    • http://files.thedinosaurcompany.shop/uploads/1/3/1/4/131453267/kevepevalanunafatoga.pdf
    • http://files.weavevirgin.com/uploads/1/3/1/8/131857562/tevowul.pdf
    • http://files.soniamadelineevents.com.au/uploads/1/3/0/7/130740116/9067048.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/43869174272.pdf
    • https://cdn.shopify.com/s/files/1/0441/3584/1944/files/96807553572.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/dark_souls_2_ce.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/tenifovojufosomuvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/54317780246.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/19536949898.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/80513262017.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/lokipamizelubow.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/79853432644.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/71580794937.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2957/files/somebebipefokov.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/86031882431.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/62019973398.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a9b.bin
a8b85c74af2455eec359dde4b48a1b7cf020985a1b26baa6ec09c2ef3790cd8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9B 5468 bytes
font_01_sfnt_off00005d0a.bin
c5d40573f781e3053a3c90d0c57cd6efd3127dafe5927a5ee1e74b0eecb78c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0A 9888 bytes
font_02_sfnt_off00007ecf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECF 4324 bytes

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