Malicious PDF — malware analysis report

Static analysis result for SHA-256 61184589e237c9d7…

MALICIOUS

PDF

49.1 KB Created: 2020-08-03 05:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da94b42070857eec7490c818500b8cbf SHA-1: a0d0006adb168fe3c0e9405e1f640e2fe7203526 SHA-256: 61184589e237c9d70b86e4a487f1eb7a30f250f880b3a33bc5697a044ed47ea2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a spam or phishing campaign. The presence of a password-protected archive lure heuristic indicates an attempt to bypass gateway scanning. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=me-+teru+no+kimochi
    • http://files.badgerwifi.com/uploads/1/3/1/3/131379290/wosasakinikejol-xiwur.pdf
    • http://files.ilovelinens.com/uploads/1/3/1/4/131407111/529178.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://files.emilychristiansondances.com/uploads/1/3/2/7/132710753/6722963.pdf
    • http://files.patiencereformed.com/uploads/1/3/0/7/130775848/9527343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/jefujotim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/jivapibunure.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/ritowevu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/momun.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/full_metal_alchemist_brotherhood_episode_55.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1848/files/photoshop_free_trial.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/95261243730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/42957115101.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/teratopuvenuzotovikusix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/xujaba.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e1b.bin
f19c38b7c1bf15c52b314be74f429aaf94d0e3c04827b62b829df5e62394c6c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1B 6312 bytes
font_01_sfnt_off000083f1.bin
59ec590091c58b41b8bbcb1ee00a465dba8253ab974abb9aeafa7166df7ebc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F1 4720 bytes
font_02_sfnt_off000093e6.bin
5bb95059a6e02c180ff0bfb100cd674e6de24a27847735205c399dbad33c6853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E6 10240 bytes

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