Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cd8fb3c600b2b3…

MALICIOUS

PDF

48.3 KB Created: 2020-08-08 10:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2736bf048d13df0d1ba956c86aea4aa6 SHA-1: e6d4bbdc01920e4b07e91b8c929426ab1ab1d51a SHA-256: e9cd8fb3c600b2b3b1bc1508acc8975fca81cfc04065608073ac073206f5a94f
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.com/pify?keyword=atrial+septal+defect+pada+anak+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier 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.com/pify?keyword=atrial+septal+defect+pada+anak+pdf
    • http://nibema.castellplaya.co.uk/uploads/1/3/0/7/130776661/12ecb3305d4d.pdf
    • http://files.mrjoelmbarr.com/uploads/1/3/1/4/131453402/e63decfc.pdf
    • http://files.sikhsaaj.com/uploads/1/3/0/9/130969944/jujoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7783/files/20538955128.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/fajok.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/vokarup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/bowflex_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/70685624887.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/pathfinder_bestiary_2e.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/49469619551.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/15741848178.pdf
    • https://cdn.shopify.com/s/files/1/0440/7971/0360/files/27438315689.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3073/files/advanced_calculus_fitzpatrick_solutions_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/carmilla_francais.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/adolescent_depression_essay.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/zateforuxexuju.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_off0000808c.bin
775129f50c6eff3aa64358784659be09a0ff59c1a61f230f595f5e1db12c6a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x808C 5200 bytes
font_01_sfnt_off0000924f.bin
43e8f9e82a4d20f538877b667a45c1948ff0b888f6a59012abd9e1a790ca2751
pdf-font-stream PDF embedded font (sfnt) at offset 0x924F 9884 bytes