Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4ce63901962939…

MALICIOUS

PDF

46.3 KB Created: 2020-08-11 05:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b95b97e4a35ebc389b8bd4ff17bb4a80 SHA-1: 345735ca07d49a71d0555b7b98039a839b9e57e6 SHA-256: 6f4ce639019629399d8dd0b62369bfba063c1ca5c93c80dabded0e2a07765e9e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to SEO link farms and redirectors, indicating a malicious intent to distribute content or malware. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=bioethics+articles+pdf'. The document body, though partially corrupted, also contains this URL, suggesting it's a primary lure. The presence of multiple external PDF links further supports the link farm tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=bioethics+articles+pdf
    • http://files.kabanhomes.org/uploads/1/3/1/3/131383607/sazukiduraza_mejuxivok_waferajebag_tokoma.pdf
    • http://files.nefrologiedagen.nl/uploads/1/3/1/0/131070849/xigomusakid.pdf
    • http://xupunibep.westspringfieldbouncehouserentals.com/uploads/1/3/0/8/130873851/kafadosavebixi.pdf
    • http://xejajuwa.communitylearningprojectminnesota.org/uploads/1/3/1/6/131606255/katosotitebas-padoginaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/amplictil_4_gotas_bula.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/58231017228.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/murarakaxezogixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/bupaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4250/3832/files/16889396209.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/76290954801.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/pdf_to_word_converter_cracked_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0432/7509/2132/files/authenticity_in_popular_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/rososorowakimujujabelope.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/45559420769.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/69318582797.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/xatetelibewafezikawugadu.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_off00007626.bin
87fb54b9e4c67434a669caa119c0adc7633a77adfab76d72f111515733d248b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 5292 bytes
font_01_sfnt_off00008819.bin
def554da111be1caa27931541d61777b3a8d39928472eb24ed8dbbda7b22f299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8819 10772 bytes

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