Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5e1c9cb78d353…

MALICIOUS

PDF

34.8 KB Created: 2020-08-26 15:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7abc6a260f2c55abc33e7a0ad8dcdd07 SHA-1: f009c5e01c2fa2cd5f0bee99a6c8aab34c99fc78 SHA-256: 85d5e1c9cb78d353d5be7c5c2807f133f548597fb1dda0bab2d41937337c4999
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=euro+pro+deep+fryer+f+1400', suggesting a lure to a malicious site. The presence of multiple PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing 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=euro+pro+deep+fryer+f+1400
    • http://wuwazeru.fbcvnj.org/uploads/1/3/1/4/131482995/1313083.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6730/2303/files/tutorial_adobe_indesign_cs6_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/zazetal.pdf
    • https://cdn.shopify.com/s/files/1/0462/7916/4064/files/cron_job_time_schedule_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5068/files/cedulas_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/bewokivoxuvodusenuwititug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/pemovejozapajalopowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6693/2902/files/sefaroxobulipisemugelos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/56446235138.pdf
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/44322843235.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/applied_mathematics_information_sciences_if.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/41832346915.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5402/files/practice_6_1_scientific_notation_answer_key.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_off00004b7d.bin
46a13871bde9fb2aa5ee1bfbd62050b4d8007a39bfadca0698a87d5a24d071d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7D 4956 bytes
font_01_sfnt_off00005c83.bin
fc878b768ec73b531e7355f96eb157899990a2f7c5fdaae58f8aedf6d2e98d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C83 9924 bytes