Malicious PDF — malware analysis report

Static analysis result for SHA-256 673d90251fb00719…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 02:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 843e99b2413882f13f39b1f44323cd30 SHA-1: 42e65df33b1fe78c6bbecf44663e5a7e932387df SHA-256: 673d90251fb00719add1ea473a919cb80cea48073b571fb69f7e01e8e1b95627
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=airmore+pour+android'. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests an attempt to lead users to 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://ttraff.com/pify?keyword=airmore+pour+android
    • http://tatakupa.naturalcoach.com/uploads/1/3/1/4/131454859/3ca5543990c25d5.pdf
    • http://files.landslidetechnology.com/uploads/1/3/1/4/131409090/f8b019a.pdf
    • http://putonun.dharmayogawheel.com/uploads/1/3/0/8/130873958/13c9fd048d9c0f.pdf
    • http://files.swintechtrw.net/uploads/1/3/1/0/131070611/3be71b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.pdf
    • https://cdn.shopify.com/s/files/1/0429/9292/6873/files/8030962225.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tomazemajetel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/61695160092.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/acidosis_lactica_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/scheduled_caste_and_scheduled_tribe_prevention_of_atrocities_act.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/co_branding_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/febazefidagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/2843405748.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/2001_audi_tt_owners_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000599c.bin
df7b3127aa9b90e59d7f18cecb8d68f5176acd21d9db39d2135dbbee661a20cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x599C 4684 bytes
font_01_sfnt_off00006950.bin
7eb8d5d4de6a5e6d8f36b9ec9f0b36260802cbdd1c9d611680e7ed8e1bfabcdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6950 11816 bytes
font_02_sfnt_off00008e7a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7A 4324 bytes

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