Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c7c921177f2775…

MALICIOUS

PDF

40.1 KB Created: 2020-08-23 18:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 594e20d4943342cb6e75ebef68e12f60 SHA-1: 664383ce9becb2c9d35eb4daa0850adbd7b866c5 SHA-256: 71c7c921177f27757e63c367fd06ef8ab5194d4b07f7b2f18a09a6b28239d688
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 of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://ttraff.cc/pify?keyword=excel+flowchart+templates+free', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure text and URLs.

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.cc/pify?keyword=excel+flowchart+templates+free
    • http://files.miamidogshow.org/uploads/1/3/0/8/130814226/wekedejekodevulo.pdf
    • http://fovazili.torontocycling.org/uploads/1/3/1/4/131438379/633f8aa027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6172/2786/files/avast_secureline_crack_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/php_contact_form_with_validation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/mini_14_full_auto_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/24166498221.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0647/files/military_bugle_wake_up_call.pdf
    • https://cdn.shopify.com/s/files/1/0434/8497/1173/files/24964955483.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/73225053532.pdf
    • https://cdn.shopify.com/s/files/1/0428/6870/3398/files/amenaza_de_aborto_primer_trimestre.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/40244287472.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/lanareruwonesakak.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0476/files/45250387085.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/bahra_cable_catalogue.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_off00006082.bin
a13a7113fbdfc0b16fb0ee450c146fe8a9a1dd83cc81c2cef7f9bdd89e2c2e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6082 5372 bytes
font_01_sfnt_off000072b6.bin
5368cb5ea43af59e95a3b5f27e7936feaa3df3e9de84e1864e9c0e59131bb494
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B6 9712 bytes