Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d43364d4bcc77ed…

MALICIOUS

PDF

41.7 KB Created: 2020-08-24 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4552b5b86252b39e17d4e06f044368bd SHA-1: 39e30bfed2ad9d1e7a56863d36bbdadce4a9112e SHA-256: 7d43364d4bcc77ed022ac95a4c86d1496cbf17136dea1ed79a8110c14dd5c0b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with the primary URL `https://ttraff.ru/pify?keyword=healthy+soul+food+recipes+pdf` identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to manipulate search engine results or phish users. No scripts were extracted from this sample.

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=healthy+soul+food+recipes+pdf
    • http://files.doulakaribirthservices.com/uploads/1/3/1/3/131380295/4170461.pdf
    • http://files.sterconwalds.org.uk/uploads/1/3/1/4/131453291/1332249.pdf
    • http://bowixase.dancefoodforthesoul.com/uploads/1/3/2/3/132302872/wamogapikogogi.pdf
    • http://files.icehorizons.com/uploads/1/3/1/1/131164250/parupamat_semisaxoto.pdf
    • http://jatizu.josefjakobs.com/uploads/1/3/2/7/132740978/xukuvobirizoj_supitojepubu_nuliwozin_bisegodezevosiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/pikosujali.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/64580818191.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9127/files/bonibepezupabobuzemabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/35324005806.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/39551068854.pdf
    • https://cdn.shopify.com/s/files/1/0439/1026/7035/files/alt_balaji_new_series_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/kaart_achterhoek.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8167/files/42037233866.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/ccsp_cbk_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/8785773768.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/75543417719.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/51839878517.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_off000064ff.bin
347ac82ebd9b16123e1e070fc2720fa757236e18e2c2a72cec8bb9af556c3651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FF 5308 bytes
font_01_sfnt_off0000770a.bin
763b7c8fa9c90b2d212037e58c161f38a485215504e8a83ed20c6dc103fcdbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770A 10180 bytes

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