Malicious PDF — malware analysis report

Static analysis result for SHA-256 05028f57d2bfdf0b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-23 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3addfab95031b4d1f8b74e02d049f808 SHA-1: 229e6329825c1c87ea058c2b8e7b950591c34ced SHA-256: 05028f57d2bfdf0b8d16b7ba2c77f762eef342496c727150dbe18f4962150bc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=formation+animation+club+med'. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting an attempt to direct users to malicious infrastructure. 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=formation+animation+club+med
    • http://files.joelbryant.net/uploads/1/3/0/7/130740092/7900908.pdf
    • http://tusinu.edwattsframing.com/uploads/1/3/0/8/130813490/norazigugex_vikejimodadap_zuwomajubid_wevezinaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/android_activity_appcompatactivity.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/dell_compellent_sc8000_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9513/8208/files/nomunanugibuxanizin.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/84150797280.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/77426869074.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/77300672693.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/73835134922.pdf
    • https://cdn.shopify.com/s/files/1/0444/3491/5495/files/xubejorawelasakavana.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/49246276730.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/golongan_bronkodilator.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/africa_map_image.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/jesamavaluv.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/the_easy_guide_to_jazz_guitar_arpeggios.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_off000071ef.bin
b9f7dea9843625f6f741f0b6a82ff34df1109fe3bc599005ff58edad8d087000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 5000 bytes
font_01_sfnt_off000082ca.bin
bf6e6bde3222f23ac85831ae225cadcdabe09b82124fe2b4b3ac4e1959490673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 10224 bytes

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