Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd53f8b8cf2e400e…

MALICIOUS

PDF

50.5 KB Created: 2020-09-16 21:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcbe11c20bfbe5ed5443bd9edb710ba SHA-1: a2487e93fec0b874556fbdc41dc272aedb0a47a3 SHA-256: fd53f8b8cf2e400e7201704d92ab71fac75253ff1600e1b9bc22cf7a8ca62864
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Savage Worlds toughness calculation' and a URL that appears to be part of a lure. The presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and deliver malicious links.

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.link/wix?keyword=savage+worlds+toughness+calculation
    • http://nonafe.killarabyod.com.au/uploads/1/3/1/3/131398140/16321.pdf
    • http://files.roswellnorthmusic.com/uploads/1/3/1/8/131856723/fokimu-gubetiwem-fenaxalisep-jixetekof.pdf
    • http://nefaj.fijileaks.com/uploads/1/3/2/6/132682787/5ff1ce29ca22.pdf
    • http://files.aquabydesign.co.uk/uploads/1/3/1/4/131408970/gilixutepasuromugum.pdf
    • https://debdfb44-181e-46b5-ac10-c278f960bff8.filesusr.com/ugd/d1c05f_1bfa1cd65ff746d884b7d175c5739821.pdf?index=true
    • https://fe4c9c8d-c2f2-4ae8-9e53-7eec50c502f4.filesusr.com/ugd/277b62_c70ec0c622f6463daeeacb160a2a7fc0.pdf?index=true
    • https://0b561bd9-71d7-4901-a855-a1b555beb445.filesusr.com/ugd/dc8a8e_90bf3d32d7104061955bd16486661911.pdf?index=true
    • https://5de74dab-1b64-45ee-9bfc-64076b877f63.filesusr.com/ugd/595093_68fa166ee259412b988c3ce3db34d371.pdf?index=true
    • https://90f459f5-8ad9-4e10-9f58-aac4f3c20ccf.filesusr.com/ugd/54dfea_eaf2a0985de141438a205158457d75e6.pdf?index=true
    • https://1d6efe7f-ded5-402e-a8c3-fc03b539ce30.filesusr.com/ugd/4b874d_493ff9311cad471e99eef78633559698.pdf?index=true
    • https://a05ec3c7-d6a8-4cb5-a6ce-6b4f7d1fd93e.filesusr.com/ugd/ea2c45_6c5cb13810de4c078d196f08d4473fc5.pdf?index=true
    • https://7170d7ea-6863-4b3f-93b8-6fd63f013c93.filesusr.com/ugd/d4579c_2108f4ba561b4e3fb0f88dbd0d1b4b97.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/3503/9656/files/yowhatsapp_7._99_anti_ban_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/lcd_2004_i2c_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7819/6129/files/50739658003.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/
    • https://0b561bd9-71d7-4901-a855-a1b555beb445.filesusr.com/ugd/dc8a8e_90bf3d32d7104061955bd16

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085b3.bin
498be6330fd68b1a5365db067baf202f50da86d92772f2fd48af413d10d8867e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B3 5456 bytes
font_01_sfnt_off0000984f.bin
eab62897637cc2e082e90803580da78641d37af4dee54799c23d77cababae25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984F 10668 bytes

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