Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a072148c05db583…

MALICIOUS

PDF

44.7 KB Created: 2020-10-27 20:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90094cfc1bfa9130c82a0c856ce78639 SHA-1: 13bde8d734ff050970cd8cff5553e7d541032cf5 SHA-256: 9a072148c05db583cdd45177b2a923f4f499dc0db46d86694659b03b8d4261c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'testng interview questions'. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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://gettraff.ru/123?keyword=testng+interview+questions+naveen+automation
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f8e448e87991.pdf
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f8d52df1e567.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f89ac6482b08.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f873fe62b4b8.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f92cc330972b.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5f985f71581ea.pdf
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8dc4c2dc9cd.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f896aa6ac770.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8cfe2452294.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomogas/87979175672.pdf
    • https://s3.amazonaws.com/roware/ahlak_nedir.pdf
    • https://s3.amazonaws.com/tadovu/letexejive.pdf
    • https://s3.amazonaws.com/zuxadol/futerikoxenupaxu.pdf
    • https://uploads.strikinglycdn.com/files/05f49480-8b8b-485e-b71e-f48017f4a07d/lopopominixi.pdf
    • https://cdn.shopify.com/s/files/1/0502/9406/3269/files/falo_the_bard_a_shiny_helmet_of_flight.pdf
    • https://cdn.shopify.com/s/files/1/0498/5441/5015/files/superlative_adjectives_explanation.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_off00006e84.bin
ff03a94026e14fea1352cde80fd4e306794eb94fe17f3b5be268c64e97ee6777
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 5200 bytes
font_01_sfnt_off0000802f.bin
b72e65aed14a7f51b5a95401cd31e2578b672c25c49d8138128430a587804b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x802F 10992 bytes