Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0c77b5c3818cbe…

MALICIOUS

PDF

40.1 KB Created: 2020-09-12 08:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b5e76fca7f9cb38926634969b1fc70 SHA-1: 6f3493569d07595ed36ff1b59db7c7f5af6ff159 SHA-256: 5c0c77b5c3818cbeab8879c77e256b3f5458bdcd0688fdc3d43e1f30b7030aa8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector infrastructure, disguised as a job inquiry. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm designed to distribute further malicious content or phishing lures.

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.ru/pify?keyword=asking+for+further+information+about+a+job
    • http://files.dantealighierimelbourne.com/uploads/1/3/2/6/132680890/papobedi.pdf
    • http://nedilaw.coachcollinsfootballcamp.com/uploads/1/3/1/4/131455734/2982583.pdf
    • http://files.epicwalk.org/uploads/1/3/2/6/132695572/zafejafizafowav.pdf
    • http://files.learningsupport.shenfieldlearning.com/uploads/1/3/0/8/130874026/terif.pdf
    • http://files.showbizsosyal.com/uploads/1/3/1/3/131398184/nejozana-vabikukojalevo-netidenavazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e481ce_22fe02bc082241309b9b53a93a745e6f.pdf
    • https://static.usrfiles.com/ugd/9d24cb_884bd9af0c4e468b8f4b29322121b6ed.pdf
    • https://static.usrfiles.com/ugd/3db607_c85f8deaaebe404a86a49c09bca108d5.pdf
    • https://static.usrfiles.com/ugd/856cea_9b4503b8501c4752bc251c785549ef18.pdf
    • https://static.usrfiles.com/ugd/314c35_1fad3fb97d844aa896042864e1afe3c8.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/98388537585.pdf
    • https://cdn.shopify.com/s/files/1/0433/1556/0616/files/67049199000.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/archero_apk_unlimited_money.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/fetch_post_request.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/86766637657.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_off00005f12.bin
03586000a172db7c6bfb2eef723cf4dae0dfb3b5c9a08f51c5ec15322dcdc3ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F12 5420 bytes
font_01_sfnt_off0000715c.bin
a42062ff94a7b7496525300ad1bf817dd808b7b8ac99b3aed6a66915fc7c59f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 10036 bytes