Malicious PDF — malware analysis report

Static analysis result for SHA-256 0224fcfd2b2d568c…

MALICIOUS

PDF

41.4 KB Created: 2020-07-09 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 620ffea519c5c75c6979869c2bb8457e SHA-1: c405c86e1be11732929d15c88555fe5369c56e4c SHA-256: 0224fcfd2b2d568c983107754803a4a7e0c4790f6edad7e511953c4716228d37
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors or link farms designed for SEO manipulation. The document body, though obfuscated, contains URLs that are likely intended to lead the user to malicious websites. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=life%20cycle%20of%20nematodes%20pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://files.nephro-pathology.com/uploads/1/3/1/3/131398171/b88136316.pdf
    • http://files.hullabaloomusicfestival.com/uploads/1/3/2/7/132740415/zikomigop.pdf
    • http://files.stephanieclaus.com/uploads/1/3/1/8/131858043/08f28983.pdf
    • http://files.urfellowship.com/uploads/1/3/0/8/130813305/9688921.pdf
    • http://files.cvhsaa.org/uploads/1/3/0/8/130874295/nutolimijiwu.pdf
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdf
    • http://files.valleyrootsfoodhub.com/uploads/1/3/0/7/130740344/fa8b50ce.pdf
    • http://files.anudebating.com/uploads/1/3/0/8/130814280/zodeworok-surezek-vuvuvagi-pazetovisides.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dixurozazix.files.wordpress.com/2020/06/51746671016.pdf
    • https://kovevaso.files.wordpress.com/2020/06/62204530262.pdf
    • https://nobagonaba.files.wordpress.com/2020/07/xekorimopobusavesex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.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_off000065cd.bin
e9998676132ec57343b81c44242355fb7baab804d18325014398286149e19d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 5036 bytes
font_01_sfnt_off000076dc.bin
946ca7c519b822ca15e0951fbe082314629435eb8907e659b121f3551d65d467
pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 10008 bytes