Malicious PDF — malware analysis report

Static analysis result for SHA-256 add8691fb6f7a857…

MALICIOUS

PDF

55.3 KB Created: 2020-08-01 14:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f0013c4e28efc4d7b212e363949d63 SHA-1: e9eebeefd09a36922d82034739c50d7e3d40416e SHA-256: add8691fb6f7a857c4a509cd44cd9b13cc7c76bc11bc92c7d266a421932dd680
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation scheme, embedding a large number of external links, many pointing to PDF files on Shopify domains. Crucially, one embedded URL, 'https://ttraff.com/pify?keyword=rolling+stone%2527+s+top+500+albums', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious infrastructure via these embedded links.

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/pify?keyword=rolling+stone%2527+s+top+500+albums
    • http://files.wilburnassociates.org/uploads/1/3/2/3/132302871/sumej.pdf
    • http://files.neighborhoodpetscle.org/uploads/1/3/2/3/132303310/zebubon-bawukib-vifig.pdf
    • http://files.pernsfood.com/uploads/1/3/0/8/130873741/xofumafajozu-dopuripuxote-pimadiroz-vagolebapojukok.pdf
    • http://files.lifeandpeacephoto.com/uploads/1/3/0/7/130739112/1e27e2dca4.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/binojomilugaxagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4454/files/sujovixenilukokenipizonaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/3942831350.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2321/files/dopizitetakavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/1995194680.pdf
    • https://cdn.shopify.com/s/files/1/0435/8540/5089/files/26094953606.pdf
    • https://cdn.shopify.com/s/files/1/0434/3539/3191/files/68924728087.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/lobomega.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/sisipad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/lopiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/dinuvawafoninu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000761b.bin
c68ae9d647bd4ac74f77307e80d8712efcf796907ba0ae27dffe07bd9edc3ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761B 5372 bytes
font_01_sfnt_off0000885c.bin
eba1374f94e5f70549652449d98302746ac3060c5d01473462775a06169d099b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885C 10476 bytes
font_02_sfnt_off0000ac40.bin
1a7d51b35fa435d78829072ec5c98a4245d1ab716f7fd4f3f2d540fb6d940dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC40 16200 bytes
font_03_sfnt_off0000c186.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 4324 bytes

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