Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd671881c4d927d9…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 02:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0955f38278287610e881b8eecff36c14 SHA-1: 7a77f7d43708227c48721f8acbeea9913e1cc248 SHA-256: bd671881c4d927d9caac6548776b5ca37e7ea3f91290e5c21a22c0b2e7a47adb
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains multiple embedded URLs. One URL, 'https://ttraff.ru/wix?keyword=hillbilly+elegy+free+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary attack vector appears to be luring users to click on malicious links within the PDF.

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/wix?keyword=hillbilly+elegy+free+pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/sabedibuwepukijezadax.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/nuzobekad.pdf
    • https://cdn.shopify.com/s/files/1/0461/3390/3513/files/boss_and_me_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/7033399189.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1526/files/66163647479.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/betubudamidav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/suwexuwovukubiduvupirowa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/wimasekefubinuxegu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/12481668335.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/ang_dating_biblia_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/33769743892.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/rangitaranga_english_subtitle_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/schneider_easypact_mccb_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/tibojurebufofadodo.pdf
    • https://cdn.shopify.com/s/files/1/0461/9131/3059/files/zefuzazofavegivosonako.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/jumixi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f14.bin
207e06a8b05de72b272c6beb8075884a1129e3de35e8d529732aeaec0a9afeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F14 4516 bytes
font_01_sfnt_off00005e70.bin
327d0d6e32be53d65daff6c28cb32b83db3a4785d3a69aa4a43fdbbe67d01711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E70 9328 bytes
font_02_sfnt_off00007e30.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E30 4324 bytes

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