Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc85be98c6eb5f2…

MALICIOUS

PDF

45.4 KB Created: 2020-08-15 22:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef53551abe41ac62fe85510b2f3008a8 SHA-1: 664f79a1f29f61587aef71fd179af037b3835223 SHA-256: bdc85be98c6eb5f20ccd8831ad44780665c6dc18019845f23a5b67229a0decdc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'reading comprehension' and the URL itself, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicated maliciousness, and the PDF structure shows a link farm designed to distribute traffic to various external sites.

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=true%20false%20reading%20comprehension%20pdf
    • http://files.ocms-mi.org/uploads/1/3/1/0/131071191/mebawalubokodimibu.pdf
    • http://lamuruz.directofficefurnitureoutlet.com/uploads/1/3/0/8/130813765/rovivamogepemutopaz.pdf
    • http://files.foodjourneywithraul.com/uploads/1/3/0/7/130775672/worawuj-pamaworere-xapuwavamos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/wafoxepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/26819594092.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/automation_anywhere_control_room.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/breast_cancer_signs.pdf
    • https://cdn.shopify.com/s/files/1/0436/9547/2793/files/lewulul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0452/4644/7776/files/40713146127.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/kings_of_crunk.pdf
    • https://cdn.shopify.com/s/files/1/0447/5705/7687/files/klasifikasi_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/80497786038.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000503f.bin
a06197dca6b2fd7ff1f6d8dbe6a411f74f94336c88fbd78c665fe9f9fbad26b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503F 5320 bytes
font_01_sfnt_off00006217.bin
8987aedd929e056a5164be2c7385d6f2998fcfe2b134af02dbd42557c50d939a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 10268 bytes
font_02_sfnt_off00008576.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8576 16092 bytes
font_03_sfnt_off00009a3e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3E 4324 bytes

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