Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cb78973e6394d5…

MALICIOUS

PDF

39.7 KB Created: 2020-08-03 08:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f864a210a9596b942abc04227112f100 SHA-1: f06a26c7ddad4c7d92716de166e79132a0175560 SHA-256: 22cb78973e6394d51f5141126b23b12b1902284083d2fd9184306235f0bc62cd
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though malformed, contains text related to 'Form i134 instructions' and the wkhtmltopdf application, suggesting a lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to potentially harmful sites. 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.cc/pify?keyword=form+i134+instructions
    • http://biruno.marinlivinghomes.com/uploads/1/3/0/7/130776167/750449.pdf
    • http://files.nepcoawards.com/uploads/1/3/0/7/130739170/viketelapojal.pdf
    • http://files.msamsonovcpa.com/uploads/1/3/0/7/130740011/534521.pdf
    • http://files.maranathabiblens.com/uploads/1/3/1/0/131070846/8904599.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/44734566759.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/dopagujadurop.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/79689808171.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/demenejavumadawuruz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/xesokosoruxifofozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/tokivowubozusasemutipofuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/piwumenije.pdf
    • https://cdn.shopify.com/s/files/1/0448/5152/7842/files/ethics_theory_and_practice_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/7181759389.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/tubirifuzopegipepunakak.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/tevevetofozumeduzoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/75574857936.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/4720348087.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/34595121718.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_off00005e4d.bin
4b19f5751147202baa9211febd3358c201dbd4ba845d7198f495de47e308d258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4D 4960 bytes
font_01_sfnt_off00006f2b.bin
618b1a9bc1682822f0ed12423b174cd13993e1e158f562466d68d4af44b8e1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 10256 bytes

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