Malicious PDF — malware analysis report

Static analysis result for SHA-256 43253117f1b70e31…

MALICIOUS

PDF

51.0 KB Created: 2020-07-13 22:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49a7190912a66874631afda9b251da0 SHA-1: 8fbf9616ec36f170b3ed1cb5b733787620c6bd4b SHA-256: 43253117f1b70e31150eaf4706732465ae98a6f0a590dbb332d002ffd3995c24
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a workout plan, suggesting a phishing or social engineering attempt to drive users to malicious 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.cc/wb?keyword=jason%20wittrock%20workout%20plan%20pdf
    • http://files.challengerelementarypta.com/uploads/1/3/1/4/131406735/8538177.pdf
    • http://files.sfventuresgroup.net/uploads/1/3/0/7/130775529/fisig.pdf
    • http://files.matthewpeckhamtenor.com/uploads/1/3/1/4/131483371/muver_jilimunerumuvil_gelowebipudaz_doroviz.pdf
    • http://files.harvesttimeaog.com/uploads/1/3/2/3/132302928/3600958.pdf
    • https://toruxot.files.wordpress.com/2020/06/vojoduzezatirututad.pdf
    • https://sosabufuji.files.wordpress.com/2020/06/41239390539.pdf
    • https://nuwasiv.files.wordpress.com/2020/06/52395453010.pdf
    • https://joziturir.files.wordpress.com/2020/07/43896201904.pdf
    • https://kafikosaku.files.wordpress.com/2020/07/kafit.pdf
    • https://miduxawugi216825278.files.wordpress.com/2020/06/96557576215.pdf
    • https://jozemobesome.files.wordpress.com/2020/07/20905456338.pdf
    • https://mewojuzimug.files.wordpress.com/2020/06/60887509083.pdf
    • https://rufutekinose.files.wordpress.com/2020/06/sovakivelinupopixoloxebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rofimoluxita.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/damerup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/wogajurutowika.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/pumirumevoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/23824411553.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/46723565777.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://joziturir.files.wordpress.com/2020/07/438962019

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089ed.bin
23b54c46ac9d03e7a333d29f3750a82b192f8a7c5b66bc20e795f94fa2c8cd13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89ED 5060 bytes
font_01_sfnt_off00009b36.bin
2d04a3a10f4ba83100396a3fc05d0aa01ba46c2680ed30869c0958ec37a318a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B36 10316 bytes

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