Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9fb3d81505d9b…

MALICIOUS

PDF

35.7 KB Created: 2020-08-23 08:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51991ba415638e344b255012373b45bc SHA-1: 447bcbff79d3bdac749b6c3e239f6f6d8592e7c6 SHA-256: 6bb9fb3d81505d9bfb85ee251d8925aa664b2a09266adc7fcf19dfba63b01769
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, a tactic often used in SEO link farms to manipulate search engine rankings. One of these links, 'https://ttraff.cc/pify?keyword=tropical+background+free', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains many embedded URLs, reinforcing the link farm and redirection attack pattern.

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=tropical+background+free
    • http://gepuxu.globaleducationmove.com/uploads/1/3/1/4/131438500/dodopamusumawovu.pdf
    • http://debiwulow.crjuices.com/uploads/1/3/0/7/130738909/rivomi.pdf
    • http://files.practicalhomeplanning.com/uploads/1/3/1/4/131407423/fituvadopenux.pdf
    • http://foriditek.alicenyquist.com/uploads/1/3/1/4/131406082/2f9d4dfee39426.pdf
    • http://files.stonerstakeover.com/uploads/1/3/2/7/132712174/288f7b9c39bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/77535772302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/inspirational_quotes_poster.pdf
    • https://cdn.shopify.com/s/files/1/0440/1371/5606/files/wizipuwodivumabanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/6814428835.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/guwatotebazarinarori.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/923103327.pdf
    • https://cdn.shopify.com/s/files/1/0428/2669/4822/files/wuxixoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/xazemidijakefaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4007/1070/files/5266064958.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_off000050a6.bin
b786ee6f9c60fe85119103226c53c3c0e6449221bf55f2f428b7d7dc13a468d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A6 5300 bytes
font_01_sfnt_off000062ad.bin
f6aeca6301d64e48fe3cc1f4ac947da3495551a77a4936a859ddf024cbb0e543
pdf-font-stream PDF embedded font (sfnt) at offset 0x62AD 9080 bytes