Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db656ead9f53949…

MALICIOUS

PDF

40.3 KB Created: 2020-08-10 19:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2243b3087302b9dd1cc8bba0dd22debd SHA-1: 993d1c8a04615601c45d25a4c27b8eb4558586f6 SHA-256: 6db656ead9f539493acfd2a4bab06dd56e2780afd6b6b8d49f8547c99f132021
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, classifying it as a link farm. One of these links, https://ttraff.com/pify?keyword=casperjs+download+pdf+file, is identified as a known malicious redirector. This suggests the document is designed to lead users to potentially harmful content or phishing sites.

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=casperjs+download+pdf+file
    • http://files.dididiphotography.com/uploads/1/3/0/9/130969895/jokadosasusumo.pdf
    • http://files.krystalwatersystems.com/uploads/1/3/2/6/132695818/4744849.pdf
    • http://files.candlecafe.com/uploads/1/3/1/4/131483154/doxirivixepe_mozagita_banirijamo.pdf
    • http://tuzimexup.baliliveentertainment.com/uploads/1/3/0/8/130874232/vudixufilefasopab.pdf
    • http://gumovufo.sardisdoorway.com/uploads/1/3/2/8/132814930/6956819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/critical_reading_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/anatomy_and_physiology_chapter_1_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/tejeliguxuxegabopeti.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6933/files/pthread_cond_wait_example_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/20072974865.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/12957108542.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/lozokatibovove.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/33978814210.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/malaria_parasitemia_grading.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/tezidadepidelexabidosud.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/78128243223.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/suzeguwili.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_off00006068.bin
693a36416ecdc35653b77104aaa548804921bfa79659bc3db328cf7abc1f8ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5108 bytes
font_01_sfnt_off000071f4.bin
c3aab1653ec9a3e57ca12f448eedacac24219c8f55dff4e3e30a9b49602d8d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F4 10044 bytes

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