Malicious PDF — malware analysis report

Static analysis result for SHA-256 089ebbcab5733f0b…

MALICIOUS

PDF

34.5 KB Created: 2020-08-10 16:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088c805c91374777317156e385986585 SHA-1: 35dcdb8e59414df2acf85e6798be26658a1e2fe3 SHA-256: 089ebbcab5733f0b522507584f894a3cb379d4e3b923000b5fa74ee1d69dc9c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness.

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=bargaining+for+advantage+negotiation+strategies+for+reasonable+people.+pdf+download
    • http://files.tallywood.com/uploads/1/3/1/3/131383651/d116d6f48cc531b.pdf
    • http://jokopar.blissfulfarms.com/uploads/1/3/1/3/131383483/3088146.pdf
    • http://files.emilyrosewills.com/uploads/1/3/1/4/131454620/0e476a148.pdf
    • http://files.pattyschroeder.com/uploads/1/3/1/4/131454355/xelawonuletise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/53901018271.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/allele_specific_pcr_principle.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/69212023914.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/61049726564.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/57737297658.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/fitbit_zip_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/mikipilejubule.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/36081284763.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/vetagatapuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/rojewediza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/physics_formulas_for_class_11_and_12_cbse.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_off00004785.bin
8a28b1f891879ddcad7d0fea2565ea4bce9b5514987260bc2d75c49f692f6378
pdf-font-stream PDF embedded font (sfnt) at offset 0x4785 5584 bytes
font_01_sfnt_off00005aa2.bin
7b75001875680ea27e67f33624961f248dcad4bf76aa4c1a3b75537956168ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA2 9840 bytes