Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cd78c43c73bb3d…

MALICIOUS

PDF

54.2 KB Created: 2020-08-03 12:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16cdda93a82eaaaee80d1e3e4d897bf1 SHA-1: a1c76caed6a25619adab4a04e399d26bc96ccaef SHA-256: 43cd78c43c73bb3dc87f5806b145c94509fec5d27b8b3b4c7de56330ee95d94b
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=tinker+tailor+soldier+spy+pdf+book', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this same URL, suggesting the primary intent is to trick the user into visiting this malicious link. The presence of numerous other Shopify links, while benign, are part of a link farm strategy to improve search engine ranking for malicious content.

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=tinker+tailor+soldier+spy+pdf+book
    • http://files.jimpendergrass.com/uploads/1/3/1/4/131437427/faxulipu.pdf
    • http://files.contemporary-flair.com/uploads/1/3/1/4/131438188/9435341.pdf
    • http://files.spencercountygop.com/uploads/1/3/1/3/131383575/4d4741ab7fe.pdf
    • http://files.bellaalaf.com/uploads/1/3/0/8/130874128/a45878a11c.pdf
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/zepotilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/78883800590.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/33027551776.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/59854993546.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/55670999222.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/lizeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/5318612201.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/womodopoxip.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/sogamikibijoduvewasikeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0354/files/vabisigiwavajefugivov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/4620451447.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/3410824458.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.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_off00009780.bin
2146250f7236a180c431163b95b5a9787834876daf123d8e61d629daf524e93a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 5292 bytes
font_01_sfnt_off0000a991.bin
c285e4eb3d03c989aefe3fdc46247bbbb9692d458e8130e8768a63289c3fca40
pdf-font-stream PDF embedded font (sfnt) at offset 0xA991 9880 bytes