Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16c9a5ff7049b1c…

MALICIOUS

PDF

32.4 KB Created: 2020-10-09 05:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15cb0b38d88de20a70d2cd86c0ee6320 SHA-1: 54bc5cc9c5db0db7dfb21b32020221120cd7fb08 SHA-256: e16c9a5ff7049b1c93ede3bdb48d063cb8322df154ba33b327a87e137011d530
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify and Strikingly domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true purpose as a link farm for educational content. The ML classifier also flagged this PDF as malicious.

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://cctraff.ru/pify?keyword=7-1+skills+practice+dilations+answers In PDF document text
    • http://files.bodycareclinicriverside.com/uploads/1/3/1/0/131070476/katekonabajurom-vajeza-musuzaboka.pdfIn PDF document text
    • http://zepar.808cco.com/uploads/1/3/0/8/130873851/vebizukino_nadesovesiv.pdfIn PDF document text
    • http://files.victoriafca.ca/uploads/1/3/1/6/131606255/4f397a92.pdfIn PDF document text
    • http://files.bestselftherapy.com/uploads/1/3/1/1/131164079/aa4173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4520/3351/files/best_monk_race_pve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6074/6408/files/runabekarimitugagivot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/jackson_racing_supercharger_k20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b81c0be-baae-4ccd-b766-419b679a4488/64808097206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4eaed1-63fc-4330-992c-392eb46eb996/1153904753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e2a036-e7da-4f9a-9149-638719ebe9b5/sepokeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa023d1f-f560-4c9c-a1f8-aa679a1eb7c4/77386500079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c96808-52e1-4d8d-8d5e-41d0022d7ed3/79190233603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5963a05-52c0-426e-9b78-d78f46f79464/gebel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2471ca-efa6-41d6-8ed8-028d6c7b897b/33798086607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8401a9-600a-423b-91e9-5eab9d96a98e/60663405103.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4390 5292 bytes
SHA-256: ab2205a426ab4d3d74c0a3958be41ded06016f18f70ebcb7b89389a5701cc8f4
font_01_sfnt_off000055bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55BF 9092 bytes
SHA-256: 03de412792dea6f3f64e4558df5e8d8998899fd736ea2ac40776643bb2a6f7f0

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