Malicious PDF — malware analysis report

Static analysis result for SHA-256 8835e27fc269a7ce…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 02:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3086fa9a777d36f3e12f8bfbfff4b13 SHA-1: a6721116f4171dd54fbf7aee3131f32f1cc7c1f8 SHA-256: 8835e27fc269a7ce6d85ec3c5c2b77a51eafc2a0b15c2979080a22d58ea03831
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, 'https://ttraff.com/wix?keyword=aritmetik+dizi+sn+formulu', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links to external PDFs indicates a link farm designed to distribute malicious content or conduct phishing attacks.

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.com/wix?keyword=aritmetik+dizi+sn+formulu
    • https://static.usrfiles.com/ugd/b8c837_a98497e1b8d24f86be0b459402fb4a51.pdf
    • https://static.usrfiles.com/ugd/30e015_f98dad2351b54335b041ee3f74b910f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59f6c0eb37742cda4586de8e5ae4a8a.pdf
    • https://cdn.shopify.com/s/files/1/0438/5164/5093/files/kutolezafekilunogipuza.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/57701821674.pdf
    • https://cdn.shopify.com/s/files/1/0459/9077/2895/files/adobe_flash_player_11_plugin.pdf
    • https://static.usrfiles.com/ugd/b8c837_20ef6ccba5964ecfb694e2da3c44c52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ae687dded894163a8793a6b9aac9a69.pdf
    • https://static.usrfiles.com/ugd/b8c837_8049b98673904312b7b2d5c28064677c.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/60546680085.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/gapewefazupap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4679/files/tulakosavabidi.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_off00005d7a.bin
e667c2d09114fdabfabd729b86a4f9d71a9b6d69d44d6a72ba273dd1beeeaaf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7A 4948 bytes
font_01_sfnt_off00006e43.bin
bcf9b9d0bcfc960a65648d824b9bc89c2778145a097eaf9da5d379f819fd595d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 15608 bytes