Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca14d355502af273…

MALICIOUS

PDF

35.5 KB Created: 2020-08-24 23:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47616820fa2ddbe15d21f43a3b40091 SHA-1: ce9876f4060e028aa8ebecf8b92c875d1a9a5d93 SHA-256: ca14d355502af2731b235dc0df8d55d02bd3b5e23293e656d30eacdbc106d103
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is further obfuscated by a keyword parameter suggesting a lure for a 'fake caller id apk free'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure and the malicious redirector URL.

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=fake+caller+id+apk+free
    • http://files.jadegardais.com/uploads/1/3/1/3/131379719/viniputokilusadilog.pdf
    • http://metigikiw.adventuresatyourdoorstep.com/uploads/1/3/0/7/130740572/9585232.pdf
    • http://files.shreveportchamber.org/uploads/1/3/2/8/132814930/rutofedelabanu_pujegiwazudu.pdf
    • http://files.visurragaenterprises.com/uploads/1/3/1/3/131379503/firitimulebusor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/fokijujuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/difference_between_antigenic_shift_and_antigenic_drift.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/lojama.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/top_answers_in_job_interview.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/7_little_words_bonus_answers_may_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/28775913836.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/proceso_adiabatico.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/outline_of_matthew_s_gospel_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5654/files/35243247670.pdf
    • https://cdn.shopify.com/s/files/1/0439/2737/1931/files/82860677470.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/diritavasuvudubamunoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/wexomajenanumuzimedenax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/mechanical_vibrations_rao_5th_solution_manual.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_off00004cf9.bin
9a6ea20419d82680817cfd41f4f2b3bb84ccc29df2c27493328b815ab554d158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 4992 bytes
font_01_sfnt_off00005e01.bin
9407c9c172831b6a9aab046efa37206b8360bc3dc7c49b20eaf7254663f72bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E01 10304 bytes

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