Malicious PDF — malware analysis report

Static analysis result for SHA-256 553549a7563d87f1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d26c5281cc9ab0ccf08fe7e2ac6e9190 SHA-1: 7844853bbda6e9ab471dbf368174686ca65e57af SHA-256: 553549a7563d87f1910e61a4266ab1033e12ca947c9526ea4b0869b4a8593956
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body contains text related to an Alzheimer's report, likely a lure to disguise the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=alzheimer+disease+international+world+alzheimer+report+2015
    • http://kovexa.mamayeva.org/uploads/1/3/0/8/130874113/patex.pdf
    • http://tutadewof.lilyteng.com/uploads/1/3/2/8/132816066/dijib_pusupodevos_nenesute_fazed.pdf
    • http://files.bathcitysociety.org/uploads/1/3/2/6/132682848/diwajixukamex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/94135242627.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/41159057152.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/gurubaxipug.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/bridge_over_troubled_water_piano_solo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/quicken_loans_arena_seating.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/pakugipadujunabazufim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/difukidatar.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/9577171562.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/76579362527.pdf
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/sexoba.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/widaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/bixozunopegene.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/tesadose.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/57255530875.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/61250719244.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_off00006d84.bin
f9b755a67d5c20db1d7e60b700a309a8c9dfba59f7e52605d7ca9708a6cc9a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D84 5780 bytes
font_01_sfnt_off0000812a.bin
3c680d4ab77d3ea8d8b80753760bda0aca43adf3b5ed0e0965494404b22f5256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812A 10264 bytes

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