Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec762ff439519e9…

MALICIOUS

PDF

41.3 KB Created: 2020-09-01 02:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa7a273267448717d5f384c4dedf1e1a SHA-1: 7f6b1e6b0a29f08a7b781a979c4d0a6f5c3c2b32 SHA-256: 5ec762ff439519e918d112f42eb9b5209e484223d473e8657f6da9755b69d37c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'back exercises pdf nhs' and the malicious URL. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content.

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/wix?keyword=back+exercises+pdf+nhs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/5376/3999/files/django_templateview_vs_view.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/53781056717.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/dukajepa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/mekanifabesunig.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/67932984060.pdf
    • https://static.usrfiles.com/ugd/405339_d844640db6304a13987f02934b018f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9a87dbf2e664bdab103f1c35b27ef26.pdf
    • https://static.usrfiles.com/ugd/ae059d_37863d7a856742a4bec50d432e38d224.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.pdf
    • https://cdn.shopify.com/s/files/1/0441/3430/1848/files/96204266407.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/vebezinuvuzuvonemobes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7551/8107/files/hiv_testing_guidelines_naco.pdf
    • https://static.usrfiles.com/ugd/4c1554_0f3ae5df241144049c1727ef44da0671.pdf
    • https://static.usrfiles.com/ugd/eed56f_5c5ee2cc38944d6fbeabdbffe3b054e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_994f233a8f7142e2aa9eb3e797c90b38.pdf
    • https://static.usrfiles.com/ugd/6f7357_dc58562cb35f4a7f858c03ea3eb5f3e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc492b0b03549709b0c968f3d0f165c.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_off00006509.bin
0751e922586aa5d21cd0b62b39f0a090dedc6f25b4ee2b8115228dac5334bef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6509 5392 bytes
font_01_sfnt_off00007762.bin
dec61947d0414b8f9b5ab0560abe249517fd3a88113f1ebb55f803531b7311a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 9596 bytes

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