Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d76378d2621a66…

MALICIOUS

PDF

43.5 KB Created: 2020-07-31 20:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9555ffd495f54a8a4025bf54e9286893 SHA-1: 4b3ed8bed1dd38599d55e4eb0ca4d80e1484af2e SHA-256: 77d76378d2621a66bc1bd3e4cb7df95d7a5ce1bd7587f7c4a4314eb918ad0414
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness.

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=quarterback+young+thug
    • http://files.paristaxi1.com/uploads/1/3/2/6/132682607/davif.pdf
    • http://files.opadental.com/uploads/1/3/1/3/131379594/539cbd45a69b.pdf
    • http://files.wildthymeflowers.ca/uploads/1/3/0/8/130874541/mabetiviker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/doweb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/puxesudejibovosigav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/22932062392.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/dusovubusogufikenaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/20672549644.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/japotosemogatifujelakor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/dadifesunuzekixozekeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/ruzolul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee5.bin
08e091889aa25fcd0b01fd243dfa10529041985625f6042833ed8eb2fe30c284
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE5 5052 bytes
font_01_sfnt_off00007014.bin
bc3f87db82e34c5c74eb4656046377e6de460d00bf726b9d68727433f36181cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7014 10392 bytes
font_02_sfnt_off0000930a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x930A 4324 bytes