Malicious PDF — malware analysis report

Static analysis result for SHA-256 038f69c7981f3425…

MALICIOUS

PDF

36.1 KB Created: 2020-08-03 10:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b99589646f383a27cebe9de0df3f76 SHA-1: 31aaae5a60e235a704e25d2b54e8f4d7ed80bcbd SHA-256: 038f69c7981f3425534657f07a29b81eed8abdfcaa70cf2229b49d6a47f7ea7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other Shopify links, suggesting a link farm or SEO manipulation tactic to hide the malicious destination.

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.com/pify?keyword=mud+rune+osrs
    • http://files.glitznglamonline.com/uploads/1/3/1/4/131437532/1ae81085b78e.pdf
    • http://files.lapen.org/uploads/1/3/0/7/130776381/9fce548d3.pdf
    • http://files.atlanticseasaltcompany.com/uploads/1/3/1/3/131398332/6088b97d7d02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/91975374133.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/judisatifatipugedezaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/31688687367.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/nodoxiwokef.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9557/files/toxosed.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/72080924154.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/xepirasemutipididuvoliwik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/muratozofoxudenatularilex.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/fanowudowiwenuguxunidabe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/rejon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/17366608784.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/accounting_intern_resume.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/jivavune.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_off000051a2.bin
d2a209a953d6bf93305e402c5e05d8f8c2d4cbed7d7ba0bacdfaa5177ae456f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x51A2 4580 bytes
font_01_sfnt_off00006150.bin
df3d4137b4aac652f0317f39fb330019512424c52cf7d299c79ad585604e4ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6150 10132 bytes