Malicious PDF — malware analysis report

Static analysis result for SHA-256 107b68197252c971…

MALICIOUS

PDF

44.0 KB Created: 2020-08-02 16:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0635f5a04be17c68f83b116f7eec3189 SHA-1: c37c6d38ea8f84c2531c6bc0b42ae1d2dace8d2c SHA-256: 107b68197252c971c80d76c5b2dcc646340497674234caa56d72931f7b7a792d
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 a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=chilton+manual+online+free', suggesting a lure to access content via a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=chilton+manual+online+free
    • http://files.nobarkingartgallery.com/uploads/1/3/2/6/132681992/4df9a5.pdf
    • http://files.swissblisstravel.co.uk/uploads/1/3/1/4/131406108/bofojito.pdf
    • http://files.michelsacademy.com/uploads/1/3/2/7/132712315/67b8578.pdf
    • http://files.katsmodernizedhomedecor.com/uploads/1/3/1/6/131606343/172308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/jomaped.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/vokobilafosurunaxidekim.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/95910403135.pdf
    • https://cdn.shopify.com/s/files/1/0431/6286/1730/files/maxako.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/sekakezokovazomuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/navedarepiwafalamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/how_to_port_forward_spectrum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/kofegamisixupaxeze.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/31933854807.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/93720487103.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/xebukonutojivuxukiput.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005580.bin
0e6deec5684304a92a0717c3de61d5fc825d98407d5fff615d19e7af95512318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5580 4732 bytes
font_01_sfnt_off00006565.bin
523a01852bf2f3a80cb475a18ebb40b6b77aee254254f1ea912fe37ccc9dd0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 12264 bytes
font_02_sfnt_off00008c8d.bin
43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8D 16132 bytes

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