Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e49f2d2e9f5912…

MALICIOUS

PDF

44.2 KB Created: 2020-08-01 14:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25b35d03978a5b3fd63eb41f6539c94 SHA-1: cb00ba38ed255d69c0426518d2ca1eb6ebf16301 SHA-256: 13e49f2d2e9f5912de42ada80bc5cd1a1d281f0f614687b5e1d7c63b9209bd68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. It also contains a large number of links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or redirection attack. No scripts were extracted, but the embedded URLs are sufficient indicators of malicious intent.

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.ru/pify?keyword=mount+hood+meadows+weather
    • http://files.fiestaomaha.com/uploads/1/3/0/7/130740069/vopumasapu_poxutoxetorovev_sukotajadidufu.pdf
    • http://files.sunnyandsavvyrootsco.com/uploads/1/3/1/4/131407705/a78a3aee06a387.pdf
    • http://files.stanleystreetbutchery.com.au/uploads/1/3/1/8/131857494/3980500.pdf
    • http://files.mjkoos.com/uploads/1/3/0/7/130739158/vagenowari.pdf
    • http://files.diegelrabbitry.com/uploads/1/3/2/3/132303163/6389eee500f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/mefubinilupesezafumuzo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/79043963518.pdf
    • https://cdn.shopify.com/s/files/1/0433/0949/8536/files/kofaputevelaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2085/files/monstrous_compendium_volume_three.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/59074257550.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/98647286740.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/97460388002.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/45850906102.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/pudujepupikipigizufode.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/40865989324.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/neloger.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/pijositarudik.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/cuda_vector_addition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/burutomuxubiruniwifozap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/84102192940.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_off00006198.bin
9f93d7a2f757510c444087470e7e01fbd46435578aac2830ec037703f228a4ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6198 5128 bytes
font_01_sfnt_off000072f3.bin
9b2ad400e8727d9c7439f1d5421a7b788a261d4cd09718509866c246c244a006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F3 15828 bytes

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