Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db45feb4c557c6…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 20:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59c19103e3044034525a4378f86489e SHA-1: 21b6baed840d69e5360b755aaf2582800a4d300f SHA-256: b9db45feb4c557c6da1b55986ca4753e674c8d82e38a8dfd69e90a55d5309f03
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=how%20to%20permanently%20rotate%20pdf%20in%20adobe%20acrobat'. The document body, though partially corrupted, includes the same URL and topic, suggesting the primary intent is to drive traffic to malicious sites under the guise of providing useful information.

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/wb?keyword=how%20to%20permanently%20rotate%20pdf%20in%20adobe%20acrobat
    • http://files.wbdesign.info/uploads/1/3/0/8/130814110/6367889.pdf
    • http://files.thewildember.com/uploads/1/3/1/8/131872015/panarevetolun.pdf
    • http://teragus.lunaproduction.org/uploads/1/3/1/1/131163658/wavawugoto.pdf
    • http://files.williamstonfoodbank.org/uploads/1/3/0/8/130815437/3168256.pdf
    • http://files.iamshweta.com/uploads/1/3/2/8/132815178/92429e7.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/linagejodamoruwer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/41864747261.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4229/files/xefajagotejap.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/xulilubiwudobonepefawesiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/43492084707.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/vegexerebupuvasitolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/16407242674.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/wowivez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/14933453677.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/autodesk_inventor_frame_generator_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/dubuxijuremugifugajor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/unearthed_arcana_monk.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_off000062c3.bin
4db094b25763aaf032cf5d34a7d6b4668b8b9a38b729324b48aca412487fdbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 5416 bytes
font_01_sfnt_off0000752c.bin
65feaf6ab43fd918b5537ee5f9be9b6f10d9202d6db560f47b02620461091a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 10076 bytes
font_02_sfnt_off000097e7.bin
d2703eec0843ee934b0a8bba7850da2550094fb4af61d17619ccbf35009047d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E7 16104 bytes

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