Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1391bfd857072f…

MALICIOUS

PDF

43.2 KB Created: 2020-07-26 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f96b8e746ad36ff60e2a034473f2c1ae SHA-1: 6c80d9814bfb2590e084a979226d4e948ef2969b SHA-256: 7e1391bfd857072f1f4139bf92d7d160265d2f2fe525c03bad102c4c8e81b9c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

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/wb?keyword=strategi%20pemasaran%20umkm%20pdf
    • http://files.michellemorrisonwrites.com/uploads/1/3/0/8/130815137/xizevenib.pdf
    • http://files.scottwardart.com/uploads/1/3/1/8/131871690/rukupasamexa.pdf
    • http://files.mayidesign.co.uk/uploads/1/3/1/6/131637177/nazinagusum-pifogit-pixosisib.pdf
    • http://files.life-mdinc.org/uploads/1/3/2/7/132712093/1987969.pdf
    • http://files.sistainthebrotherhood.com/uploads/1/3/1/1/131164076/b4fbc3be17385f1.pdf
    • http://files.scottwardart.com/uploads/1/3/1/8/131871690/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/sudukapujade.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/petefiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/tobaxupanegemezopuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/fezamowa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8658/files/nanavobiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/binikexuvipizobud.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1778/files/dukiju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/20600227644.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/robimosaromifalotoroj.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dfe.bin
0928ad1f9a0ce80197243530fff1105fb000c49041cd9cadd46fafa090dc2746
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFE 5268 bytes
font_01_sfnt_off00007fc7.bin
25f736a8f3ed7a832afcac13c2a8e44644ef718ae269d5665255dc13a9d34191
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC7 9344 bytes