Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe464594b86c787c…

MALICIOUS

PDF

43.3 KB Created: 2020-08-17 09:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f464f1c70c68184aed5622dbbdaf8763 SHA-1: 6d2a437d247fe96df4514d221091dc945a5b7575 SHA-256: fe464594b86c787cff4846e499f1238d2b40a4ac2acdc4c5e8bd96589b84726b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=ultrasound+guided+aspiration+seroma+cpt+code`. This indicates the document's primary purpose is to redirect users to malicious sites. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains hosting other PDFs. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and redirector link are sufficient to determine the malicious intent.

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/pify?keyword=ultrasound+guided+aspiration+seroma+cpt+code
    • http://zemalovop.cathedralofthebeloved.org/uploads/1/3/0/9/130969204/nunedukogux-tojovonopufikol-toxamodu.pdf
    • http://vekekeko.glennwoodhillsretreat.com/uploads/1/3/1/3/131382486/4996930.pdf
    • http://files.kind-mind.org/uploads/1/3/2/8/132816096/diwevuf_liniv_rebuxamixakep_pudubekibikarog.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/zafakidomekoxomidekuxuwex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/80964901226.pdf
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/jupox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/74524980263.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/programming_the_world_wide_web_sebesta.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/belong_to_you_vi_keeland_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/79210131666.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/vuwenezudapopefosan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jerozex.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_off00005b45.bin
a3cac7c086d0a2417d2c338e15822ccb8bdb2d8603bcaf2f3d7717f875f590c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B45 5268 bytes
font_01_sfnt_off00006d0b.bin
cc71bca2b6fe4ad4fa3c0320a96bef50805b39cbb157f070a9291d82841a7202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0B 11112 bytes
font_02_sfnt_off00009276.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9276 4324 bytes

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