Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f464f58d65fc8…

MALICIOUS

PDF

55.5 KB Created: 2020-08-07 23:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd99cf140ee85d6a5d899fc9f301ff36 SHA-1: 05807fa8280d1c6cfa0e185d65fcb76b4558c98b SHA-256: 8a5f464f58d65fc842efdfcee9ba20298f58f8520dfe13bb4930072df6af174f
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=pathogenesis+of+inflammatory+bowel+disease+pdf'. Another heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0431/4618/2822/files/moscow_moscow_lyrics_english.pdf' being one of the initial URLs. The document body, though heavily obfuscated, also contains 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.ru/pify?keyword=pathogenesis+of+inflammatory+bowel+disease+pdf
    • http://files.vitamassage.com.au/uploads/1/3/1/4/131438330/rirasigefofota-bimanudotili-fuxifidi-vuluzotetesuluw.pdf
    • http://files.randomtraveler.net/uploads/1/3/1/3/131384573/fuwelufu.pdf
    • http://vawigu.k9lane.com/uploads/1/3/0/9/130969754/pixiveboli-nezufef-bujisubuxog.pdf
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdf
    • http://jobuj.win19.org/uploads/1/3/1/4/131453698/muxopinimijal_pikubobotaviz_reritifajegufif_voretamafukija.pdf
    • http://vawigu.k9lane.com/uploads/1/3/0/9
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/moscow_moscow_lyrics_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/14000835870.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/88131955128.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/lonewuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/59428762857.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/jafokogevikivefobalutivuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5810/files/ziwegoximepeni.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/6501179664.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/33690406468.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/fozexorawelifo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/wemomizuvofizex.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/tudiluzuvuxituzojikuze.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_off00009902.bin
ed0d68fe974e33478659f2f054389044c477865a11136123cebdbcc77f057f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9902 5788 bytes
font_01_sfnt_off0000aca5.bin
a7eed7bb7b0392a1ee78a92106444b3acb142cd7454e58453e3f0f023187e7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA5 10888 bytes

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