Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6af34a1f72e89c…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 22:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d370b59c4a44e8b097369705a88d14cb SHA-1: 2f852fbce23352c8c6b6e333d5330770ffa66d75 SHA-256: af6af34a1f72e89cce01805bbc51bd876509edb1a978aee0eb8709580b416392
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=blood+dk+pve+guide+bfa, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains this URL, reinforcing its role in the attack.

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=blood+dk+pve+guide+bfa
    • http://files.rusticchalkdecorshop.com/uploads/1/3/0/7/130775382/906b08689b464.pdf
    • http://files.lewisfp.com/uploads/1/3/1/3/131379113/8037294.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3389/files/mutixijibarapid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/kolipapowazonivifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/83567126254.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6764/files/c_naming_conventions.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/diname.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/21434078721.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/72529579376.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/56039203956.pdf
    • https://cdn.shopify.com/s/files/1/0430/3542/6970/files/39508700039.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/shield_icon_on_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/gubefudobaribiviwizu.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_off00006169.bin
fab7f4968600c8b6c030b0b060383faaa2100d60148b5cf6f71dedc0a839a07e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 5248 bytes
font_01_sfnt_off00007369.bin
516879288944042d75a196fdc5b8af10c6f484f203d237187f8a5e7608f8f9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 9860 bytes