Malicious PDF — malware analysis report

Static analysis result for SHA-256 effd32930ca1cdda…

MALICIOUS

PDF

35.8 KB Created: 2020-07-10 11:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcdd06bf5da53c57076ce92e7c5a60e4 SHA-1: db73360f51de67382817721d03daac348222f22f SHA-256: effd32930ca1cddaef77f51d7198cd6ee84ba23e503d05e59c0804a405b356e7
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, masquerading as a dictionary. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated but contains the initial lure 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.com/wb?keyword=urdu%20to%20turkish%20dictionary%20pdf
    • http://files.gwn-phma.com/uploads/1/3/2/7/132741020/movevaju.pdf
    • http://files.eastafricanscholarsfund.org/uploads/1/3/0/7/130776718/vemofuva.pdf
    • http://files.brownswoodnursery.com/uploads/1/3/0/7/130739375/bipakujifezo_mujelokifufor_xugumeg_xaburidexexu.pdf
    • http://files.givewildlifeabrake.com/uploads/1/3/1/1/131163854/7aed9fb8d.pdf
    • http://files.ncstateroleplay.com/uploads/1/3/0/9/130969545/4382149.pdf
    • http://files.thusiasdaevangel.com/uploads/1/3/0/7/130776655/zarik.pdf
    • http://files.ladiesinpigs.co.uk/uploads/1/3/1/1/131164252/tonus-tijetadubo.pdf
    • http://files.waterbirthisrael.com/uploads/1/3/1/4/131437799/tevujekafa_wagiwivuxope_revunawowoxa.pdf
    • http://files.donnace.studio/uploads/1/3/1/4/131453268/weditoduvisojo.pdf
    • http://files.rintheyordle.com/uploads/1/3/2/6/132696263/zaluwovekire-vuduxalabomo-darofogososonef.pdf
    • http://files.chrisvosters.com/uploads/1/3/1/3/131379039/getala-kuzoga-jogezi.pdf
    • https://gonaburezi.files.wordpress.com/2020/06/99900435105.pdf
    • https://fepejobibiju.files.wordpress.com/2020/07/detajedaxizovozezuva.pdf
    • https://dezixoniwi.files.wordpress.com/2020/07/tovotosuda.pdf
    • https://komozaxanib562273029.files.wordpress.com/2020/07/bojivevufinidebedofip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.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_off00004ed2.bin
cb07a578a56d345d30724ba1ad4a585fd9ee0376073169e77bb4d33927565599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED2 5132 bytes
font_01_sfnt_off00006044.bin
adc7a806070001d6f201cdefd1bf76880d463bc5f2da7c6b7cfb39414881f932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 9472 bytes

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