Malicious PDF — malware analysis report

Static analysis result for SHA-256 be525805a9d204cc…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 09:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce07069c22c2829c922105001211000b SHA-1: ac36dc85a67ca3bc59a089d4be7704cdb5d4fafa SHA-256: be525805a9d204cc7e8b314b9d2c1ab6f87f29992a708e8402e8a7c2c6d92a02
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector infrastructure at `ttraff.com`. The document body, though heavily obfuscated, contains a URL that resolves to this same malicious redirector. This indicates a likely attempt to redirect the user to a malicious site for phishing or malware delivery.

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/pify?keyword=perimeter+and+area+word+problems+grade+6+pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.sugarmaplecharcoal.com/uploads/1/3/2/6/132695602/769796ed70.pdf
    • http://xezadaw.ctkfriendsofmusic.com/uploads/1/3/0/7/130775129/gekotawakusi-welewilawerot.pdf
    • http://jenuder.escapeabstracts.com/uploads/1/3/0/8/130874524/79ffef.pdf
    • http://files.coastlinepainting-nc.com/uploads/1/3/2/6/132696335/noselijaxejuwid-milufumipom-kixedexu-lapudon.pdf
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/cnc_machine_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/57373325033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/vekowofabapiwajijevavoxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/lulukexubilur.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/romanticism_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/77926975030.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/perceived_behavioral_control.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/84606236852.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/anesthsie_tronculaire_dentaire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661a.bin
95f744258ce4a4a66e5411e2d46591e5883d4016e935c7dce7e49fb6d2c33a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 5748 bytes
font_01_sfnt_off000079a5.bin
b6d332d63d52ba5218d06ddf74e24faa4e6e57df40a6b3296680b37bba61d4c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 10420 bytes
font_02_sfnt_off00009d83.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D83 16144 bytes