Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fc01a634551c87…

MALICIOUS

PDF

44.6 KB Created: 2020-08-21 01:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 473776ebfa072160bb033a1c99970dd6 SHA-1: f9481721737e11e4c4d0fe1717c5580c0dbada8d SHA-256: 66fc01a634551c872044f59efa319d803d50c4ddab4edaa080d93d10892c1c40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one prominently featuring a redirector URL that is flagged as malicious. The document body and heuristics indicate a lure related to technical content, likely to trick users into clicking the malicious link. The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=c+byte+array+to+pdf+file
    • http://foperape.lightningridgerealestate.com.au/uploads/1/3/0/8/130874218/wesewexewapo-romujogu-gisabisumipom-patopedelu.pdf
    • http://rulewerod.frankklohr.com/uploads/1/3/0/7/130738714/5690280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/psychology_articles_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/72998634341.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/31601948641.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/resume_cover_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5959/files/letabirojemaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/39663045640.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/learning_java_through_alice_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/video_games_lana_del_rey_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2086/1092/files/non_borrower_credit_authorization_form_ditech.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/xopivekototofigod.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/87793479267.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/workforce_thd550_manual.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_off00005f3a.bin
7aebed53997f26ebf8ebe3f4bf0ac574ee398c786a6634fd6157020fe3dec5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3A 5004 bytes
font_01_sfnt_off0000704d.bin
96c76614a85a6543281b03368dbd61dff17fd74dd12fe8335e6634bd476cfd31
pdf-font-stream PDF embedded font (sfnt) at offset 0x704D 17536 bytes