Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bd3a55e46dda4d…

MALICIOUS

PDF

80.9 KB Created: 2020-08-11 00:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4402113e468c7e90f4b8571924caddb8 SHA-1: 03d2e33c780ee3dac9a0cb90d5a4267136cc9210 SHA-256: 77bd3a55e46dda4d0140db3a34acd3680d4037b7bb639561e6792467285a2786
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to physics and the wkhtmltopdf application, suggesting a lure to disguise malicious content. No scripts were extracted, but the presence of many external links indicates an attempt to drive traffic to malicious infrastructure.

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=circular+motion+and+centripetal+force+pdf
    • http://lenijemot.nualahairdressing.com/uploads/1/3/1/3/131379706/48df03eb958f.pdf
    • http://files.reinehauspoodles.com/uploads/1/3/0/8/130874180/silaxoserus_xixub.pdf
    • http://files.rossdillon.com/uploads/1/3/0/7/130739510/2055053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/29519132692.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/90375104820.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/18301693042.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/wetasitamebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/nemixuzenakozopusef.pdf
    • https://cdn.shopify.com/s/files/1/0436/5906/7557/files/balancing_chemical_equations_practice.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3335/files/tikexufowilebug.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6971/files/arabic_numbers_1_1000_in_words.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/doveromusefekeguravuduwak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87074842841.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/suwomifesozo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4666/4349/files/ruzapegamevipajufadesifuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/wirofalago.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_off0000dc82.bin
3f568ffe3fdf63ff2849d5622d158fa23572c8da921228a97aa2b91b206065a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 5028 bytes
font_01_sfnt_off0000ed7b.bin
7a7d68bda570ba4a4ca22c2c55efbe7678f9217ecd8717cea4e8dccd475e541d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16264 bytes
font_02_sfnt_off000120f3.bin
28c03bcf599e3456f71dbda7a9940e8017c4b7a6e15fdbd9d4eba8bfcd1a11e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16064 bytes

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