Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d260334d2707db3…

MALICIOUS

PDF

45.8 KB Created: 2020-08-07 15:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 013922d4a2c08f01c46615dd3a19a17b SHA-1: e37fb23099aadde5f4d25f1971bc58c2d9c4cf3b SHA-256: 7d260334d2707db333eedf83fb7932f6770c8aecbb44b184696c5be8748af4f7
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about 'irrational beliefs scale'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK directly indicates this, and the ML classifier strongly supports the malicious nature. The document body, though heavily obfuscated, contains the primary malicious URL and numerous other URLs, many hosted on Shopify, likely to obscure the malicious intent and appear legitimate. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=irrational+beliefs+scale+pdf
    • http://files.wlotusliving.com/uploads/1/3/1/4/131406258/6074576.pdf
    • http://files.rcmcm.com/uploads/1/3/1/6/131637374/1866021.pdf
    • http://files.bilboshappypaws.com/uploads/1/3/1/4/131406841/338afc.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/92725612184.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/fowikalozas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/mapupaxaxuwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6195/2155/files/dowajirivemojotiwolaboku.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/nuvukofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/mafogijexoker.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/51521188743.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/oxford_discover_grammar_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/the_blue_planet_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/fukoponubowasiwogiverafo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0344/3361/files/zotaxijerulogivom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/59932190716.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.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_off0000740c.bin
9b74d895e264d20a73c215724fe0c741bd7b2dc25712068a020bbe0f4553159d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 5224 bytes
font_01_sfnt_off000085d7.bin
0a746fb70fab7f8da42d61c5f4fe08b0d793b6abc5767dc2cbf41fbcf59d2b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 11052 bytes

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