Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a17be94a8c35f1b…

MALICIOUS

PDF

49.8 KB Created: 2020-09-09 07:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 019e0070676f79e3166a8dd5af851d82 SHA-1: 2aa05535ca1b44f56d426364e0ea91001e800c76 SHA-256: 7a17be94a8c35f1b6add7055e877e4291b4095b9db83686ac9b9d9d032270119
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for educational content, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.link/pify?keyword=guided+reading+strategies+for+kindergarten
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0446/9896/0026/files/trophies_aryay_remix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/dugafatajolumijutatetupug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0167/files/notipovajetixeto.pdf
    • https://static.usrfiles.com/ugd/735424_550622eaf60f421087228d0452da8e09.pdf
    • https://static.usrfiles.com/ugd/09273f_7ecd21295a3d450d8defd8348e1a408e.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/belly_dance_workout.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/59325544784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0462/0409/2569/files/britannica_encyclopedia_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0389/files/9869846515.pdf
    • https://static.usrfiles.com/ugd/eda9ba_ce4d592bdcee4150a2ae2536ce8eaff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebea13e3c4a541a6bf99565aba021981.pdf
    • https://static.usrfiles.com/ugd/585b1d_79b05fe43ce34d6799f9d1ef0255a57e.pdf
    • https://static.usrfiles.com/ugd/1813b3_ea8b5b36cd874192b33e710645f005c6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f67.bin
113d29289a61368074549bb7a665c45420327fb4c2c0c8f7f9824afb056fc5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F67 5020 bytes
font_01_sfnt_off00008085.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8085 1800 bytes
font_02_sfnt_off00008913.bin
0a7b1d53f569140dcc31bd249d119a89188d220ef3f381071709b585f6ee395a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8913 10112 bytes
font_03_sfnt_off0000abb0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB0 4324 bytes

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