Malicious PDF — malware analysis report

Static analysis result for SHA-256 85499456dad646da…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 22:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d2285846563492596181a931ac7e97 SHA-1: f17ba40a04e038496a50d907172d7ab682278713 SHA-256: 85499456dad646daf8e85a40f4253d4293bf06d9caf37960e512631090516118
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 link farms designed to manipulate search engine results. One prominent URL, 'https://ttraff.ru/pify?keyword=nsou+assignment+cover+page+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to academic assignments and the malicious URL, suggesting a lure to a malicious site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=nsou+assignment+cover+page+pdf
    • http://rozedon.sustainablerecovery.net/uploads/1/3/1/4/131407406/600719.pdf
    • http://files.macontracs.org/uploads/1/3/1/6/131606965/906086c9.pdf
    • http://files.thefamilyfido.com/uploads/1/3/2/7/132740637/1901223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/lufavamarogedix.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/13563514220.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/kudijogoroxor.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/fotifojujosalemusofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/40961193866.pdf
    • https://cdn.shopify.com/s/files/1/0437/2122/8442/files/dogogafawisuniti.pdf
    • https://cdn.shopify.com/s/files/1/0435/3143/6186/files/45003326298.pdf
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/27812622401.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/bojurorexasogifunidom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/harry_potter_easy_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/exponent_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/tawoxuvidozobexatuderi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3937/2965/files/tefukigazumowojabarewuris.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_off00006524.bin
f6836c612abe10224004d53765250fcdbd58860d1c6c99301444af0cc9907572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 5472 bytes
font_01_sfnt_off000077be.bin
4ed290491bc56ddeafb45954329628dac7089ae0c9e0b91d3931ae5358be949e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 10296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.