Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fc6d28c75481f2…

MALICIOUS

PDF

37.2 KB Created: 2020-08-31 01:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11d6a1b6022639a5cecba4185fb3d8ec SHA-1: 6de2f1a146651cebf12206f586ce9e9fcda69e7b SHA-256: e0fc6d28c75481f2456621b612a6ee337c3031d40df6d87bc612a7f3a2d7973c
152 Risk Score

Malware Insights

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

The PDF file contains a direct link to a known malicious redirector, ttraff.com, disguised as an English reading test. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or redirection attempt. The document body, though heavily obfuscated, contains the target URL and keywords related to the lure. No scripts were extracted, and the PDF structure itself is the primary vector for the attack.

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/wix?keyword=b2+level+english+reading+test
    • https://static.usrfiles.com/ugd/b13fd1_8ba3d735bb7b448a94e186480ac7f01e.pdf
    • https://static.usrfiles.com/ugd/ea78e0_1e3c02485da24d9e9c95b78b4f8248f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcb5a92ffbb44ee88f73d57a1dca71aa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/autocratic_leadership_literature_review.pdf
    • https://static.usrfiles.com/ugd/61804c_761bf929636d4501b4ffde2a80fd9595.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d65520ceb94e2ca7dbe8c289eb4f64.pdf
    • https://static.usrfiles.com/ugd/a2d007_810eda72263b4d14a9357dc927d9a83f.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90142435821.pdf
    • https://cdn.shopify.com/s/files/1/0447/2084/9050/files/40035905511.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/julizowerupugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/50429722967.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_off00005354.bin
c1c1921817f4a1e9629128898663deb5ab7debed93a155aa8f115215750f4ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5354 5328 bytes
font_01_sfnt_off0000656e.bin
634ae1a904d0e0c1d8b3f7cd6f09050f3f85f6f9257e2d5731bf2202d44adf10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 10352 bytes

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