Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa95fde47b40ef02…

MALICIOUS

PDF

44.0 KB Created: 2020-08-29 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e22658bc54233bfcb7b10eafb6eaac27 SHA-1: 15af9ee76c6ed6ed457df83c56aeaa912cfdf8bb SHA-256: aa95fde47b40ef026bdecc5a4e3eb40fce92428c928674ef585b2314be3cfd09
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to a malicious site 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/wix?keyword=osprey+black+ops
    • https://cdn.shopify.com/s/files/1/0440/9566/8376/files/calibre_lvs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/girl_like_you_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/95632558675.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/gudikivigak.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/63521349852.pdf
    • https://cdn.shopify.com/s/files/1/0432/1289/8461/files/wutenabalonalimega.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/25104539773.pdf
    • https://cdn.shopify.com/s/files/1/0460/4126/8388/files/video_from_private_facebook_page.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/nosedagugaxovelogagelaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/viradik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0213/files/razajokugeliweb.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/29097180452.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/bpmn_notation.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_off00006e31.bin
b70c7dc27eb5b0f29048515f08558b8ebced1a8e3e119e755f248eef01d2b136
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E31 5260 bytes
font_01_sfnt_off0000802c.bin
d29ddfd1accd35f43b494639cf8815822044ebc48c9fe6798cc3435093f3013a
pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 10352 bytes