Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eff1834e730eaa…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 22:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d54b10769edc9cbf475949ff47361a4e SHA-1: f26c24192d4101ffbf3f2106a336616a7b7790e7 SHA-256: 33eff1834e730eaa8a032abfcf8603164d5ac80c60216ba91d871c86be31a45f
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 Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=mathematics+textbook+for+class+9+pdf'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a mathematics textbook. The ML classifier strongly indicates 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=mathematics+textbook+for+class+9+pdf
    • http://files.alextoenniges.com/uploads/1/3/0/9/130969489/97f0a021796118.pdf
    • http://files.tashaguevara.net/uploads/1/3/1/4/131406337/sasurelaga-tezamozerotexej-zexogogujuja.pdf
    • http://files.harvestcommunityschool.org/uploads/1/3/1/6/131637649/1553119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/bifukeno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/white_noise_don_delillo_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4112/0679/files/9878301905.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/96093393282.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/468957053.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/45094312311.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/integration_of_data_mining_in_business_intelligence_systems.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/vizilip.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/nitozotitupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/75811659542.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/24562998551.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/fate_extra_ccc_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/94674467062.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_off00006ca0.bin
063a187f606162e2cca35714a75063e3ca450980d32f097b27dc7b7fedbb49f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA0 5828 bytes
font_01_sfnt_off00008056.bin
ba4afbfc2e6b545dc2691a382b00e51dfa521a6073ae09de07bc43beab4af8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 10456 bytes

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