Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47e5c7bb093dcac…

MALICIOUS

PDF

51.4 KB Created: 2020-08-26 01:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa9c169a194e2add5b8de514038d5a6 SHA-1: 90bcb3f68fd71a0626e538c5a1d3a13e101aa1da SHA-256: d47e5c7bb093dcacd7051d46e85a2fcae031e3ee16f25f1b0fa8468fac2592be
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.club'. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure for users to download PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure 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.club/pify?keyword=elena+poniatowska+libros+pdf+gratis
    • http://files.hoarder911.com/uploads/1/3/1/4/131438216/1174773.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/bacteriologia_microbiologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/sabizimijixexadilesen.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/51234073317.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3367/files/98954383144.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/3406299764.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/calistenia_mujeres.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/zokidizi.pdf
    • https://cdn.shopify.com/s/files/1/0459/5656/3103/files/38724244779.pdf
    • https://cdn.shopify.com/s/files/1/0436/3947/2288/files/headway_beginner_student_s_book_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/sirogasifesisezikobise.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6555/files/29378708061.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008176.bin
c79b8247c17687f5b79a2e6e1d4d38b427d03a74b6add40550974105412000ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8176 5460 bytes
font_01_sfnt_off00009420.bin
7accecb880c2b0fed565a62c5cae8b27c20057ab4a355afeda0aeb37332f7926
pdf-font-stream PDF embedded font (sfnt) at offset 0x9420 2252 bytes
font_02_sfnt_off00009d89.bin
54707b82be0d32a60f4b21a1d8f41ecaf46fa62f206f9e59444546a722681629
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D89 10112 bytes