Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b30027090933525…

MALICIOUS

PDF

42.2 KB Created: 2020-09-20 03:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b2e2fe30cc1188f8355d684d7234c8 SHA-1: 7057d248509ba28317ae809d99da7704ef524f59 SHA-256: 7b300270909335250a2c1f3752c4f23f54cb25ef2783adf02dd9534b336c1f0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking Shopify URLs, suggesting a link farm or redirection scheme. No scripts were extracted, but the presence of a malicious redirector points to an attempt to lure users to malicious sites.

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.link/wix?keyword=cestui+que+trust+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/5707/2296/files/kofowaxijonuleledebaxexif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7090/files/ashby_engineering_materials_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/first_data_fd130_manual.pdf
    • https://cdn.shopify.com/s/files/1/0459/9228/0223/files/miluroluri.pdf
    • https://cdn.shopify.com/s/files/1/0461/7427/3699/files/45940163755.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0432/6155/8944/files/dunimuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4314/files/kinigusogexusaduxoju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/papitexopenudutu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/uidai_acknowledgement_slip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/property_management_agreement_template_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/grass_cutting_schedule_template.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_off000068ae.bin
bbf8b6e8cf90f5afbd7380941172b21d3db3031b90a5a5681d7fdc79f1cad64e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 4824 bytes
font_01_sfnt_off00007921.bin
149b11bd36e8f4ab4fd71b7cb3b0f925d87cb2eb9fd7123dfd876e8a31ed324f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 10308 bytes