Malicious PDF — malware analysis report

Static analysis result for SHA-256 23effa7994cef43f…

MALICIOUS

PDF

52.0 KB Created: 2020-08-06 05:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a528ed75b79d1b9ef66e0559c4d941 SHA-1: 2d67668509f7fcea4460d94fde654aa711adc2cd SHA-256: 23effa7994cef43fced2f0fa345d98817d46314b28a434f5de6ef2b9f9ed3198
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=my+english+book+class+4+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. No scripts were extracted, and the document body is heavily obfuscated, but the malicious link is a clear indicator 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.com/pify?keyword=my+english+book+class+4+pdf
    • http://files.teamfitnessonline.com/uploads/1/3/0/8/130813357/7888941.pdf
    • http://files.battlekatpdx.com/uploads/1/3/2/6/132695531/3075235.pdf
    • http://tipijodi.calvertcanines.com/uploads/1/3/0/7/130739024/mudakuzugugaku-wapus.pdf
    • http://wodok.universalhighways.com/uploads/1/3/1/8/131856725/4647359.pdf
    • http://files.colusalafco.org/uploads/1/3/2/6/132680784/f159e4238c80e99.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/prioritization_delegation_and_assignment_3rd_edition_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/ayushman_bharat_programme.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/zonapogoxumoxob.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/sama_veda_translation_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/bujojisaxufivas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/tuxodivanak.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/muzowodufevimuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/91608333875.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/sefudamotoramejumepuxefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/23118150272.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7717/files/ginuletofajapigibaxi.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/
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/prioritization_delegation_and_assignment_3rd_edition_downloa

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b33.bin
6d1e356bee43d3f3b1d9f662c8cd1b834a03b41fbf093b31b5f2cf091485555f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B33 5720 bytes
font_01_sfnt_off00009ed1.bin
ed6915ccac5e13718e188e1edfac4d269261ce2c1d8f48c91fee8c16df8896df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED1 10864 bytes

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