Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fcebc73d315639…

MALICIOUS

PDF

43.0 KB Created: 2020-08-20 10:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b27cbfbe0b72c05ade38d04de9d5ab57 SHA-1: a0865381bdb3a1682e8dc2633398e627c6f17de0 SHA-256: 63fcebc73d315639c93118c24b697d0128ffcaef1904967483d3ca3001cd23aa
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious link farm, suggesting an attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous links indicates a likely SEO spam or phishing campaign.

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=avometer+8+mk+7+manual
    • http://files.fatutoanutrition.com/uploads/1/3/1/3/131378953/diriruwovufolul_bokala.pdf
    • http://files.masonkelso.com/uploads/1/3/0/7/130738720/lovew_jasov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/vokuvafotolixivugopuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6808/files/bootable_windows_10_usb_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/jefunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/plus_two_film_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0526/files/84530663858.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/page_417_of_the_big_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/pan_card_acknowledgement_slip.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/23778762390.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5701/files/bulking_up_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/busazijoniruxusisorif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/bixajavufowapudisem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8263/files/tarukonedozo.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_off00006c2e.bin
56d6f04901322faff28acde0350a5bee98807a4017727a3ea49293f13ac1c0c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 5040 bytes
font_01_sfnt_off00007d48.bin
ecda901ffd3f771076d2394298344aa56ac76578c1377b813293382f7faf0e87
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D48 10060 bytes