Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe57a54fc444b79…

MALICIOUS

PDF

62.5 KB Created: 2020-09-01 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356e5a09835003d04fe98fd028af87c0 SHA-1: 4d251f168beee411a106b904e4352ab0890adb43 SHA-256: 9fe57a54fc444b79f62e6e6155d6ac5d7d68bee124b74aefe00a86036cfd0d23
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic firing for a redirector link pointing to ttraff.com. This URL is embedded within the document body, disguised as a 'recipe cost spreadsheet free'. The PDF also contains a large number of external links, many of which point to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly supports the malicious verdict.

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=recipe+cost+spreadsheet+free
    • https://static.usrfiles.com/ugd/de65f7_e41fba9faf4740cab3e4cbb241d2a7c3.pdf
    • https://static.usrfiles.com/ugd/64d889_92b43eb51bde45daaad36b472f016178.pdf
    • https://static.usrfiles.com/ugd/eed56f_24a6e01347b14b57bf84d50580037708.pdf
    • https://static.usrfiles.com/ugd/b8c837_9825a9fdc3954a0e9e0552a59b86333b.pdf
    • https://static.usrfiles.com/ugd/48f461_1179e02c937c4fed962b066a357f873a.pdf
    • https://static.usrfiles.com/ugd/217d68_b9df5b73226a464b8ab9a62faefadf18.pdf
    • https://static.usrfiles.com/ugd/5ad03d_4acf78aca3ca4e1da1dc1f49cd3417d8.pdf
    • https://static.usrfiles.com/ugd/0286dd_d0d3b56767b64328906908ff97741ccf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/tv_guide_perth_wa_afternoon.pdf
    • https://cdn.shopify.com/s/files/1/0462/8119/5680/files/dinosaurs_a_concise_natural_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/kajawigikamisozititi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/52396067484.pdf
    • https://static.usrfiles.com/ugd/98e298_da0818b459a74025b8fe5ba7f9b8718c.pdf
    • https://static.usrfiles.com/ugd/c0fca2_7bc097128cf0456db2aa5a54e112e3bf.pdf
    • https://static.usrfiles.com/ugd/ea78e0_e8c437642ee6429c8e64aad7e087ebf5.pdf
    • https://static.usrfiles.com/ugd/8acad3_5095d255abbb4fd0a5aee2bee9da8d96.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/
    • https://static.usrfiles.com/ugd/98e298_da081

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad08.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD08 2828 bytes
font_01_sfnt_off0000b703.bin
27ec2a596d4729b09f7a264779e797aba9175045765e6cdd3649801b02ada4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 5220 bytes
font_02_sfnt_off0000c8c7.bin
83825cc6a73825e7618a2ffca04357aa4df4429ef4c96159b072e0e5b34369a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 10348 bytes

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