Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81105a0303948fa…

MALICIOUS

PDF

42.1 KB Created: 2020-08-16 17:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e899512edb602a77e731a5c7a8fd9d4e SHA-1: 66454977721a5f5d2d771da8368edf98ce3f595b SHA-256: e81105a0303948fa9cca6bd9303b70566335769ad00dbc67cc9f5fd00f235094
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free art certificate template. The ML classifier strongly indicates maliciousness. The primary malicious URL is ttraff.ru, which is used in conjunction with a seemingly benign Shopify URL to obscure the malicious intent. The document body is heavily obfuscated, but the presence of the malicious link and the heuristic firings are sufficient to determine the attack pattern.

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=free+art+certificate+of+authenticity+template
    • http://files.destyni.org/uploads/1/3/1/8/131871816/74ff54bcde4ea2c.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/adolfo_bioy_casares_la_invencin_de_morel.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/wamuruxefugozokad.pdf
    • https://cdn.shopify.com/s/files/1/0438/8965/5960/files/nunagamerisube.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/sedodulakojokat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/rokufuguwigenatowutax.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8300/files/research_articles_on_financial_statement_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0535/3889/files/bejinezudex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/gosubifurerotazelarunogu.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_off00006834.bin
d0ea35faeb44da17aacb927cc8f04897d9b51d5f4b87a83783dcbaac75ec4fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x6834 5132 bytes
font_01_sfnt_off00007986.bin
20208414b33a682ed53eb74b9859f0d722c01379105eee68c8358c6f1d1b8c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7986 9872 bytes