Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa77624790e083d…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 16:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e701cfb28ca8fd88698001182e4987 SHA-1: 6030eab56e92ed9ec8d7f0526f60f56a22c02c2f SHA-256: 5fa77624790e083d41e85fc480c6d9536d834c999ca88f20f68bc34ac9d46d64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=beginners+guide+to+digital+painting+in+photoshop+characters+pdf'. The document body, though partially corrupted, also contains this URL, reinforcing the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=beginners+guide+to+digital+painting+in+photoshop+characters+pdf
    • http://files.brightlight-customs.co.uk/uploads/1/3/1/6/131606874/nijutinasixi.pdf
    • http://files.embracebotanicals.com/uploads/1/3/0/7/130738889/xejimof.pdf
    • http://files.gerrythompson.ca/uploads/1/3/2/6/132682607/2065921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/dosaresorike.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/2529681786.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3638/files/merge_sort_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/wutixaledimipulepagewexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/gisado.pdf
    • https://cdn.shopify.com/s/files/1/0431/7590/3383/files/calculus_briggs_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/85379741290.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/potoxus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3521/files/zetunedavabasovularowob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/jafodovibupesijefofolil.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2375/files/99619346098.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/49132138715.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000602f.bin
10cc68b77ea4fb37715f8c1fdb9897acebbe5324fc6c71fa208734dbb76d1af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602F 5468 bytes
font_01_sfnt_off000072c7.bin
e4b30438101316505b62adc8a5289a9812884407003c162ae9569dda77f39c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C7 10540 bytes

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