Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84ca47d50bc8ac9…

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba568bb29180fe549691f7fd2b5155c SHA-1: bd217b6d2b45b5bcf14a687b9d4466dbe1772e1d SHA-256: d84ca47d50bc8ac9168a7306adf978eefe8f2e858406a267a5909d328e3fcbf8
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=rhythmic+patterns+worksheet'. This URL is likely used to lure unsuspecting users to malicious content. The document body, though heavily obfuscated, contains this URL and other links, suggesting a social engineering tactic to disguise the malicious intent. 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.com/wix?keyword=rhythmic+patterns+worksheet
    • https://static.usrfiles.com/ugd/111c46_02a1d80eaaae4574846b828a370bcdbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0b9f2e80a844d1cba436aabd9056d62.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6a3929249e468a8f60bc57758d863e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/gufavodikikosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/sinejolena.pdf
    • https://cdn.shopify.com/s/files/1/0429/3125/7510/files/fafoguwapudodaguroduwafik.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/76809389521.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/vuxiwapu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0667/2546/files/43272760378.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/ingenieria_genetica_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6837/files/renefezavipev.pdf
    • https://static.usrfiles.com/ugd/b8c837_249d48c19f4e44d79ddff24efe81c97d.pdf
    • https://static.usrfiles.com/ugd/217d68_c7827684fb164d6194754c29669b62c0.pdf
    • https://static.usrfiles.com/ugd/de60da_7917087811c14c6ca628e5d94df41729.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25eb4e2fbb5406a8aed78b950a60dbc.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_off00004add.bin
6f9a4e64d16e0433f1a3db7012fba159925ac851594f5f17aac3295f398e5a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADD 5196 bytes
font_01_sfnt_off00005c68.bin
055de4969a03d15da9c295b4f2e6df40490d12d23ac0799d1c4bc8a04a950980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 10180 bytes
font_02_sfnt_off00007f0e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 4324 bytes

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