Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf44c3dca4626947…

MALICIOUS

PDF

42.7 KB Created: 2020-07-30 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2aacc6eae4fe6059889e88a12dc4036 SHA-1: 59a2d36c9fc4abdda0266ec308c2d2e8dc72aaca SHA-256: cf44c3dca4626947301d10b902905e7defffa5db56948e4eb4441992a3493dbe
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the URLs leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests that the PDF is part of a link farm designed to manipulate search engine results. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive 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.ru/pify?keyword=medical+imaging+technology+book+pdf
    • http://files.canbuildimmigration.com/uploads/1/3/1/1/131163736/jasit_zafajig_konaburawuw_pulale.pdf
    • http://files.bethanyinbridgeton.com/uploads/1/3/1/6/131637178/6422978.pdf
    • http://files.richardcourt.org/uploads/1/3/0/8/130814531/kikesasojixemetow.pdf
    • http://files.silverliningdesigns.co/uploads/1/3/2/7/132740277/3707728.pdf
    • http://files.salvadorandrade.org/uploads/1/3/0/7/130739533/9663826.pdf
    • http://files.richardcourt.org/uploads/1/3/0/8
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/72508646343.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/69184353114.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/jabimuvamewivavu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/zegekate.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/13502757144.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/fikitagipunojun.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/80115059948.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/nokudif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/44506639573.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/19362994689.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/54317443286.pdf
    • https://cdn.shopify.com/s/files/1/0433/2932/3158/files/58374291617.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/57225233889.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/xovidanokuf.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_off000068d8.bin
888832873bac5aa6751e81083d24d5f03cd8ec95db5cf3be40f7b30cb4f4ae1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D8 5396 bytes
font_01_sfnt_off00007b14.bin
08d8578d5b97b3d3fdfe1a9a25c4e3242e69d622f98d848049ec3ad64e9a21b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 10000 bytes

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