Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b96e3afb9a0b44a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cd0b7047e32c1ebf8815e709b42be0e SHA-1: aace1350c1e47ba98e719a37f07d03975da06e08 SHA-256: 6b96e3afb9a0b44aa1433e0137bf2bb68e10de7d81cb91e5b3a3540056bca0b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains and other external sites, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=auto+tune+free++mac+os+x`. The ML classifier also strongly flagged this PDF as malicious. The document body text appears to be garbled, but contains fragments of the URL and application metadata.

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=auto+tune+free++mac+os+x
    • http://xiwipolud.wbpstars.com/uploads/1/3/0/7/130775612/1988100.pdf
    • http://vazidid.personalized-treasures.com/uploads/1/3/1/8/131871390/f265e8.pdf
    • http://files.acorn-cookies.com/uploads/1/3/1/4/131483009/zirages.pdf
    • http://files.lisetteblanco-cerda.org/uploads/1/3/1/3/131379680/xufolata.pdf
    • http://files.elementsandtides.com/uploads/1/3/1/3/131379899/1925808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/28405892299.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/92375641361.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/simuxita.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3480/files/mozelogokixobubobowod.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/34589426403.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/omron_bp785_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/i_hate_u_give.pdf
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/17494282224.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/tametigumikunopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/tedamazulijiwonerem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/216551558.pdf
    • https://cdn.shopify.com/s/files/1/0441/1041/3976/files/penodirofowegokiburepe.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_off00006506.bin
5bf63a0c488cfae2b6f37b4932e4b350257d3d8c536013b41608a4235ee189b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 5052 bytes
font_01_sfnt_off0000761d.bin
a0a1caf7691eaebb85db9b23c5c702b9a525954d34dbc6e2e7ad9e50f7fd944d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 10380 bytes

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