Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f841b7a2cf40ad…

MALICIOUS

PDF

42.4 KB Created: 2020-08-14 13:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e470e2f15e43446bc89c44f11a3d3652 SHA-1: 947b9296f22bfd402b657e0c2766e9b401b00eb5 SHA-256: f9f841b7a2cf40ad709edc192e79ad6312fdeb10e8b43e3e3f8bbf6793313883
154 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 of these links, 'https://ttraff.ru/pify?keyword=converge+cfd+software', points to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the 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.ru/pify?keyword=converge+cfd+software
    • http://files.walshems.com/uploads/1/3/1/4/131411539/239caee0f17e1.pdf
    • http://medeliwu.annmartin.co.uk/uploads/1/3/0/7/130775257/gixefalob-natawoguvabomil-ligerugalawu-noroxedodozefe.pdf
    • http://files.budbarnyelm.com/uploads/1/3/1/8/131856769/ca663ab85d6.pdf
    • http://kibevid.jeecontentandcopy.com/uploads/1/3/1/4/131452977/2105451.pdf
    • http://seforefof.mirroryourbrillianceonvideo.com/uploads/1/3/0/7/130738970/fujib-vebilamid.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/megifodagel.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/62773613480.pdf
    • https://cdn.shopify.com/s/files/1/0439/1396/9819/files/pavadudagumebikex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/mechanical_bearing_types.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9977/files/xojupuxopat.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/29518922975.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/zesilibuzepuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/51232842945.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/62387242030.pdf
    • https://cdn.shopify.com/s/files/1/0436/1145/5645/files/alcohol_abuse_effects.pdf
    • https://cdn.shopify.com/s/files/1/0436/2888/8227/files/cateter_vesical_de_demora.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/77785478343.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_off00006722.bin
ccac073af771ffe541954bc5222c4af7a15579e5aead54e364cd9bf831fa76d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 5216 bytes
font_01_sfnt_off00007905.bin
43cef131acb673e3ce45559af59f3c441c3e13503b633ae094eae136dedb51fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7905 10420 bytes

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