Malicious PDF — malware analysis report

Static analysis result for SHA-256 7242a38317213a51…

MALICIOUS

PDF

43.9 KB Created: 2020-08-02 14:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e854aad28e09370ee4f3f28580865e9d SHA-1: cdca0488505ea7404fe9998963b0a488a372e471 SHA-256: 7242a38317213a5193a0eaf9380a6958455b9809f6580612319c01d19573186b
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service designed to obscure the final destination. The primary link, 'https://ttraff.cc/wb?keyword=lenovo%20thinkpad%20t480%20specs%20pdf', is flagged as malicious and likely serves as a lure for users seeking product specifications. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm used for SEO poisoning or phishing.

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/wb?keyword=lenovo%20thinkpad%20t480%20specs%20pdf
    • http://files.mocommunitytrees.org/uploads/1/3/1/6/131607010/wojodikoji.pdf
    • http://vodupil.rhlab.org/uploads/1/3/0/7/130775219/mugefufepudomakovaz.pdf
    • http://files.stlouismobilevet.com/uploads/1/3/1/6/131606331/373386086d6db2.pdf
    • http://files.jeffellwood.net/uploads/1/3/1/3/131380469/rakoket.pdf
    • http://files.hpnvet.com/uploads/1/3/0/7/130738755/belibezituduv_tuvatarovas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/27886722260.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/63475387695.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/70058471689.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/73818409963.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/ubuntu_14._04_nvidia.pdf
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/27717108230.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/14528796046.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/repepanenib.pdf
    • https://cdn.shopify.com/s/files/1/0435/3081/3592/files/kudupipigenosivuligizekoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/star_trek_roleplaying_game.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_off00006cf5.bin
3469c7b53342d7863ffb0aaa348b20c4699bd84849d53e67b6af05696aaaa692
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF5 5604 bytes
font_01_sfnt_off00008019.bin
db620260ed3cb06377b3cbd1756bace7cb404dbd2370f9b9e45bb30bdc58f850
pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 10212 bytes