Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd58f91fc02bace…

MALICIOUS

PDF

48.8 KB Created: 2020-08-24 23:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 909097cc2a695bf2ea906599ec656459 SHA-1: fe9a5602dbad9e0758f443d6d9361d9517581b9c SHA-256: 6cd58f91fc02bacece853aeec17bf55f66af6169877ed49850a1515b080ce69e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially harmful external sites.

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=beastmen+guide+total+war+warhammer+2
    • http://files.foxlakeresort.com/uploads/1/3/1/3/131379301/mojegotoj_dokuvutejivujer_zumuduz.pdf
    • http://files.generationsantiquesandmore.com/uploads/1/3/2/6/132681672/bigasip_solerasax_bawigatakafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/17726661962.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/leaked_credit_card_information_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/introductory_astronomy_and_astrophysics_zeilik_gregory.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/minalarufaxikizegipos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/vw_caddy_2017_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/57601748327.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/76845744321.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6721/files/modal_auxiliary_verbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/48762226050.pdf
    • https://cdn.shopify.com/s/files/1/0465/1561/7950/files/fewagel.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_off0000806d.bin
a6904f2fc6d17f66f5f373dc423d8e303f3929d313de51d04e6c54ffa6ae3368
pdf-font-stream PDF embedded font (sfnt) at offset 0x806D 5512 bytes
font_01_sfnt_off0000930a.bin
b302da96f2680c4c58b14a741c767899d7d393023a4da8d35628646d6a862d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x930A 10268 bytes