Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd907aab3e27b9df…

MALICIOUS

PDF

34.3 KB Created: 2020-09-04 01:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0358c6f69bbd5e4a38947b534c79950 SHA-1: ab1fda28abc6a6f19cb17d76ccd161677fe53f9c SHA-256: cd907aab3e27b9df045f95d20aed5bbf04ed2874930c3813b504817e218f10d2
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the malicious redirector. This suggests the primary purpose of the PDF is to lure users into clicking malicious links, likely for phishing or to download further malware.

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.club/wix?keyword=coliform+bacteria+in+water+california
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/appointment_of_auditor_companies_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/9888264349.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/dialysis_patient_diet.pdf
    • https://static.usrfiles.com/ugd/b8c837_c336f6b72fef46c2bcc4e53015fc24bc.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e36a09f357a84c3e8481c40bce85cd58.pdf
    • https://static.usrfiles.com/ugd/ac0094_b31efb69492c4f3a99bc99b5f62b3a7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e00a3a6dbe5044e19e79717ded6e2396.pdf
    • https://static.usrfiles.com/ugd/270e53_91178503ae5c470ea267a29189035b2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ec1fbcccb3840da889773fed91971ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f6ca73f67e24d3f811886b111bc1d4b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a3f.bin
04f0418b8d0e3506a1f6dfb2e884b1e676152d2d369710fb173a2e9ec747e483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3F 4984 bytes
font_01_sfnt_off00005b29.bin
1e88444f4ead16cba2f60dcb610a42d02bc1e43b392be4a108cf15580c78322c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B29 9960 bytes

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