Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a2cf2909e8d979…

MALICIOUS

PDF

52.9 KB Created: 2020-07-30 19:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfbe586a70f37e95819e5888585481a0 SHA-1: 58cb15b42c22c9bdcf8c7393c98d729be99b28e4 SHA-256: b5a2cf2909e8d979e332db7a2a3e957828132574a3fc7bd8d09e9e9c2d07cc05
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', disguised with a resume-related keyword. It also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to the 'ttraff.ru' domain via the embedded link.

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=bel+ami+r%25C3%25A9sum%25C3%25A9+par+chapitre+d%25C3%25A9taill%25C3%25A9+pdf
    • http://files.adventurerefined.com/uploads/1/3/1/1/131164572/4719083.pdf
    • http://files.nomadnubians.com/uploads/1/3/1/3/131379434/b3b0c70021e.pdf
    • http://files.piedmontgreencbd.com/uploads/1/3/1/4/131406715/nalakifaseko.pdf
    • http://files.piedmontgreen
    • https://cdn.shopify.com/s/files/1/0439/3297/5272/files/zikujipawevazelumirada.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44628440260.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/82034074084.pdf
    • https://cdn.shopify.com/s/files/1/0432/6762/1028/files/bikexopenawerug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/pirudusowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/lutiliwubinopepugutidanot.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/xaseluriro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/ligepog.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/25537412274.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/53992653946.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/mexifopurotimajegaledagu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/ribemajeg.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_off00008d44.bin
b5633eaa03188df3f0b3c20f7cb39ab1cd628c37d27525f03a2dde6baf8ad25f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D44 5252 bytes
font_01_sfnt_off00009edd.bin
1741297fd3f0756fdbb5e9f9400443d128c81aa172fef408ffa526f7228d7131
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDD 11972 bytes