Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d2d050f2a3ac56…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 19:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77b074ce341e3e23c2b3f1b1f8e47c5 SHA-1: 66845b1ffe8012b369d236d99635e9bc24417bbb SHA-256: 32d2d050f2a3ac56e7a3de9566a1465ed57b824a34175ddae22aa2a8db9c68a1
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for a 'stihl chainsaw manual pdf'. This link, however, redirects to a known malicious domain, ttraff.me. The document also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm abuse to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=stihl+chainsaw+manual+pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5558/files/el_abismo_seth_godin.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/duwumenazatesax.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/eccentric_training.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/47727597596.pdf
    • https://cdn.shopify.com/s/files/1/0430/1360/3491/files/stoichiometry_limiting_reagent_worksheet_answer.pdf
    • https://cdn.shopify.com/s/files/1/0465/8174/3783/files/android_1_modded_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/bofomefidoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/vunalorilabezazisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/sodiwakiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/pokemon_strategy_guide_crystal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/android_phone_tracker_with_imei.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/80807707826.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/rigigo.pdf
    • https://static.usrfiles.com/ugd/b8c837_84be0dd07e9441c8ba4c6d17d03b8329.pdf
    • https://static.usrfiles.com/ugd/78c764_95c1095f440448f99c57753e15882e8e.pdf
    • https://static.usrfiles.com/ugd/d1c05f_9fa8978989c44f59a6118d354af8b4e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_45d127f7681548068b15fb56c7872518.pdf
    • https://static.usrfiles.com/ugd/b8c837_382abbe480fc4d1691a043d002b1885d.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_off00007803.bin
a3895f6a15d3f3b39085eec90f73caf96dad22126a0beb43be754e2e7a56b0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 5496 bytes
font_01_sfnt_off00008aa6.bin
30bd183d958d6d70218e9b2e18eeb887a61c68a3b308a49571d0c1c9c4b299cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA6 10248 bytes

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