Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8281f294990b02…

MALICIOUS

PDF

56.3 KB Created: 2020-08-11 13:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5503905a6feef51dcf1ba411fe52b5b SHA-1: 43d1633bcab0384c3dd807f54f6dc01eeccc933c SHA-256: dd8281f294990b025b2bec90d5a0cb270415854015888bbd30e39d9dc5c9a5cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.ru/pify?keyword=antropologia+pdf+unam'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains the redirector URL, suggesting the primary intent is to lure the user to a malicious site.

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=antropologia+pdf+unam
    • http://zorepo.tiffanythetherapist.com/uploads/1/3/0/8/130874317/09e84613.pdf
    • http://files.unseenseven.org/uploads/1/3/2/6/132682731/3633909.pdf
    • http://files.bradysbendhistoricalsociety.org/uploads/1/3/2/7/132740836/8133492.pdf
    • http://puloxenib.grossdancecompany.com/uploads/1/3/1/0/131070313/812fde9dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/getinudawitorom.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/mixugenejojezizifid.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/kindle_ebook_format_umwandeln_in.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/analytical_mechanics_fowles_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/furos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/ethnicity_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/17615010937.pdf
    • https://cdn.shopify.com/s/files/1/0437/5724/0478/files/74066362189.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/alphabet_letters_design.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/10108046873.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/41370172004.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/
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e62.bin
8b69687e05fd5baa22b8a23f045c89b230db0c9ed90fd6f30f7130feea560e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E62 5172 bytes
font_01_sfnt_off0000afde.bin
f61953ea14c1dc773b53d12a93e121e1ed45cdd4675974bb20e264b91d0f7faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 10692 bytes

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