Malicious PDF — malware analysis report

Static analysis result for SHA-256 2298b49684f41fe8…

MALICIOUS

PDF

52.4 KB Created: 2020-07-21 21:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c52714656787d548d7735852c22855a SHA-1: 02eac77d4862020d7cfb2352fe67758313489620 SHA-256: 2298b49684f41fe84654907ae8886cceed4789b0c259ae177de62de355d6140a
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a mass external PDF link farm, with many links pointing to potentially malicious redirector infrastructure. The primary malicious URL identified is ttraff.com, which is known for redirecting to harmful content. The document body is heavily obfuscated and does not provide clear textual clues, but the heuristic findings strongly suggest a malicious redirection scheme.

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=comodat%20auto%20pdf
    • http://files.bellenewby.com/uploads/1/3/1/4/131453540/273035.pdf
    • http://files.otsegofitness.com/uploads/1/3/1/6/131606694/33034a502294b59.pdf
    • http://files.philocincinnati.com/uploads/1/3/1/4/131437474/rikanexuwuvib-rinirexo.pdf
    • http://files.sea-of-akc-goldens.com/uploads/1/3/0/7/130775633/fowowuxesuxelidito.pdf
    • http://files.platuworlds2017.com/uploads/1/3/1/3/131380723/4016073.pdf
    • http://files.philocincinna
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/88516502865.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/xomuwifisavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/kibafeb.pdf
    • https://lasogotunule.files.wordpress.com/2020/07/66034839396.pdf
    • https://xemolapubaza.files.wordpress.com/2020/07/tipalowosozimixiwori.pdf
    • https://pavofozib.files.wordpress.com/2020/06/mapikubevafaxifokorobejev.pdf
    • https://nuxiperavef.files.wordpress.com/2020/06/31098627556.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/54335433696.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/mepevuwogadaxemizumun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9755/files/gedijopiberodebimigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/69372213959.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/43492809040.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/fupafineworudojir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/wijakibilezujuvegaxe.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_off000091c9.bin
57c561b003ad40a2767005b3bb0d5798f32ef7d3c1fd65551fe12c2fe0bb468e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C9 4512 bytes
font_01_sfnt_off0000a126.bin
452425301d48257e12322515e0e17ad1a6cb7c856dbc21b2dacc34ca344942b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA126 10544 bytes

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