Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d523da3f5ab56…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 04:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b79482a65e4938fa18bdb746aa712b SHA-1: b176b82c0cfb81332a6e5b137ba272820f13163a SHA-256: 531d523da3f5ab56a851b52503c7c52f2855afa143d24beb80ea0a288b4dbeed
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Christmas songs free for mobile' and the malicious URL, suggesting a lure to trick users into visiting the malicious site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=christmas+songs+free++for+mobile
    • http://files.megfoster.co.uk/uploads/1/3/0/8/130814926/8446976.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/morubesasateparusimetaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/89593603330.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/brain_on_fire_libro_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5170/files/firexuludak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/jukamapuburararopisaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/dukepakedoluzibewed.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/mawar_hitam_candra_malik.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/74844827121.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/dufaromafixixijono.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/ashrae_handbook_fundamentals_si.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/12409881668.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_off000067f1.bin
b17ac63b4fcb4209e75df9a01a8145526b12d6769cd4336602d1e4dca7a75964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F1 5228 bytes
font_01_sfnt_off00007990.bin
954f9ea9e0c1a741a2caae9a0d9ccabd8bbfca9a6207fa3136c2c0f6d7185c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7990 10120 bytes

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