Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9dbacd63280c67…

MALICIOUS

PDF

44.0 KB Created: 2020-08-01 10:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0c4f58282ad4ca504399169f44c329 SHA-1: f992d9d88ff283b37dd430fd2b217a9dedd943d8 SHA-256: 3f9dbacd63280c6782d36ca9a2397e165e03b40433f7146fe19d6fd273ce5484
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel users to a phishing or malware site. The document body contains the text 'Valid us address' and numerous links to Shopify-hosted PDFs, suggesting a lure to trick users into clicking malicious links. 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.ru/pify?keyword=valid+us+address
    • http://files.cothrons.com/uploads/1/3/0/7/130775640/mugibufufomode_vozuzawenali_xagodufoxigesij_febotukidur.pdf
    • http://files.perthfrenchtheatre.com/uploads/1/3/1/0/131070866/gekekozunopesuvo.pdf
    • http://files.sechodb.com/uploads/1/3/0/8/130814718/2289386.pdf
    • http://files.perthfrenchtheatre.com/uploads/1/3/1/0/131070866/gekekozunopesuvo.pd
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/93750691094.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/zovegelizidufudixiwab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/21240605585.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/27185898157.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9605/files/gpg_sign_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/3978/5111/files/zalot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/97984783427.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/21191053099.pdf
    • https://cdn.shopify.com/s/files/1/0439/0679/3627/files/73660873382.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/datufozawividejizajilej.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4909/files/91399111602.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_off00006326.bin
7c689c746816e5a298d0d423c586d4410753953980d344e01a12680a52164b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 4368 bytes
font_01_sfnt_off000071fa.bin
cb4792864a8b72d4f27a3fc04957a0040182a0c88d3d97a8d2b745da7602237c
pdf-font-stream PDF embedded font (sfnt) at offset 0x71FA 10284 bytes
font_02_sfnt_off0000951b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x951B 4324 bytes