Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ff6aa27552ad4b…

MALICIOUS

PDF

50.8 KB Created: 2020-08-12 10:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cb35ef41e60e82cfcdd081974f42765 SHA-1: 4ba68be7815240c099cc625655a97d2f9382c5f9 SHA-256: 01ff6aa27552ad4b64f7507e52992d1fa34d864426694de8b600e1bbb0d38ca2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to physics exercises. The presence of numerous external links, many pointing to Shopify, suggests a link farm used for SEO poisoning or to obscure the true destination.

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=ejercicios+resueltos+de+movimiento+ondulatorio+fisica+pdf
    • http://daposewo.alliancetoheal.com/uploads/1/3/2/8/132814930/cec618.pdf
    • http://files.crystalfletcher.com/uploads/1/3/2/6/132695560/zinejebajuv.pdf
    • http://files.susanmaakestad.com/uploads/1/3/0/7/130775953/buxagifuvevagin-manugabefawemof-ditupovetadegek-kukuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3538/5243/files/17811271486.pdf
    • https://cdn.shopify.com/s/files/1/0437/2614/3639/files/zirixoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/25657015294.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/mekanisme_ampicillin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/54920588401.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/65724319082.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/same_meaning_words.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/26631674629.pdf
    • https://cdn.shopify.com/s/files/1/0439/1046/3643/files/19909404196.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/51592838735.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_off00006773.bin
bec120f92e9b4b4d3eb664725e576b8ce5cfc73405abc0610b53e9145ceda13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 5392 bytes
font_01_sfnt_off000079bd.bin
aecddc979b7aa57fce4b5aa788322ed488872625334cda733addde485602c706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BD 14972 bytes
font_02_sfnt_off0000a767.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA767 16036 bytes

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