Malicious PDF — malware analysis report

Static analysis result for SHA-256 e279134fadacfd4c…

MALICIOUS

PDF

48.1 KB Created: 2020-11-01 22:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e720474389b86f817007fef61fc5ade6 SHA-1: 14d6765004ccb31bcc5016f47a8ff2564b7aa0cf SHA-256: e279134fadacfd4c59c078322b979e6d45cbeacde9ef82fd3b69a4abec96d985
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, with a primary URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure suggest an attempt to drive traffic to malicious infrastructure, likely as part of a phishing or SEO manipulation scheme.

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.me/123?keyword=shuffle+people+say+yes
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f92697d0e755.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f99c4a85d184.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f9ce12708546.pdf
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f914fdeacf92.pdf
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5f9492e696670.pdf
    • https://cdn-cms.f-static.net/uploads/4408865/normal_5f9e87d0f2acc.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f90198b51390.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f9edb1498030.pdf
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5f9eed3fa7331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/0039/2603/files/naruto_mugen_battle_apk_android.pdf
    • https://s3.amazonaws.com/wupixufekijax/bexuv.pdf
    • https://s3.amazonaws.com/piwupevivotixi/alan_walker_faded_piano_notes.pdf
    • https://s3.amazonaws.com/sesafefanulokam/59193518934.pdf
    • https://s3.amazonaws.com/gezetega/91611403183.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/windsor_tower_madrid.pdf
    • https://s3.amazonaws.com/mexavofezoxi/antihypertensive_drugs_review.pdf
    • https://s3.amazonaws.com/zonebon/kizobuninesumisivuraxev.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_off00007e27.bin
8f18c8fede1308aa215cd538e702793348f985320e4913fa9af63823be95c787
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E27 5096 bytes
font_01_sfnt_off00008f88.bin
43b07b22f535b7de818b593c4739ca57012b9b765f7d760e0339664d50c4a8d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 10820 bytes