Malicious PDF — malware analysis report

Static analysis result for SHA-256 9566fa0e1d09d6d4…

MALICIOUS

PDF

36.4 KB Created: 2020-08-14 04:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e6e5202c1bac909dadeb46739704e0 SHA-1: db57e193d623b939b864f61efddefebb278f2fb7 SHA-256: 9566fa0e1d09d6d447baf822de18d95c3a84196b54f8648374d71eced3d3c9c2
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to 'Asphalt 7 hd gameplay android' and the authoring application 'wkhtmltopdf', suggesting a lure to entice users to click the malicious link. The presence of numerous external PDF links also indicates a link farm strategy, common in SEO poisoning attacks.

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=asphalt+7+hd+gameplay+android
    • http://files.mobilegroomersarasota.com/uploads/1/3/1/6/131606733/sasisazu.pdf
    • http://files.reinventinglife.co.uk/uploads/1/3/1/4/131438563/terupilugise.pdf
    • http://files.cheapautoglassinlasvegasnv.com/uploads/1/3/1/4/131437848/7284632.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/284355592.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/54957661553.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/wefabosupekewote.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/advantages_and_disadvantages_of_mobile_phones_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/90458176726.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1985/files/76223040523.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/vojugufopeniwosifipesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/rider_waite_tarot_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/wefapotexadepivekirijez.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/wizubujijugit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8029/4306/files/sanapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/common_user_agents.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_off000050e6.bin
43a64c74e0995c01cf7101d9480eabfc75e289b474631eba0d4d49661614fcdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x50E6 5544 bytes
font_01_sfnt_off0000639f.bin
cd509ee251533361bcf688e34a9b7f8030750aa1e77e25a31bfad3a7f66976e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 9780 bytes