Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6687b4fe93b5007…

MALICIOUS

PDF

41.4 KB Created: 2020-08-16 15:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154e67d5fb8ab7514e5de21f26c2b9e7 SHA-1: f3bd70d3bcf647e782c3a3314316bdab1fd643fe SHA-256: d6687b4fe93b50079f714143d9567fb55093d41ffcda5f4667a799cafffc2356
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with the primary link directing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=python++32+bit+windows+xp
    • http://files.bymcustommusic.com/uploads/1/3/2/6/132695244/gakoroz.pdf
    • http://dafolo.andrewburrell.org/uploads/1/3/1/0/131070356/vabewumow-lotijufetotem-jukizaxep.pdf
    • http://debuk.bereanri.net/uploads/1/3/0/8/130874631/bunotit-tonojedojo.pdf
    • http://files.dbblue.com/uploads/1/3/2/7/132710491/rifovatuxaw_jerovejule.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/mibubebineleditaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/remagokifopiwitipusodulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/14665619135.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/sinifof.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/29061080744.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/leave_letter_to_class_teacher_for_absence.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/sanezuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/american_cinematographer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/gefewemor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/dumazumufupugesemejodo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/app_store_optimization_book.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621b.bin
7df28e2692f3e631c1db63cb799717895c38b39f49c9ac77b3daa02580fcc315
pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 5408 bytes
font_01_sfnt_off00007495.bin
a87dc70aeb95ba1991e06548560618c623ce1361f65f533f231bc6e430fc3201
pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 10648 bytes