Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7236449b795dba2…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 21:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cae2f28193f7df5860c8095f11c5f2d SHA-1: 9ea3fbfb210e7e30e5b57edfeeefd11a1c32f140 SHA-256: a7236449b795dba2ecddd79d7f2dbdf168251faee11d0c051f045b4690135454
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt to game search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=atmel+89c52+microcontroller+datasheet', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to microcontrollers and appears to embed URLs, reinforcing the lure. 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=atmel+89c52+microcontroller+datasheet
    • http://files.pathpointstowellness.com/uploads/1/3/1/4/131437474/19039c2396a9.pdf
    • http://fewunun.theprettythistleboutique.com/uploads/1/3/1/4/131453384/9fa9e79fda79.pdf
    • http://files.ohiohostclubs.com/uploads/1/3/0/7/130740420/8325619.pdf
    • http://files.inyourpacefitness.com/uploads/1/3/0/8/130874691/677352.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/15541429185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/bemetunug.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/glencoe_earth_science_textbook_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/3817/8470/files/babalu_menu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/vitibobeposej.pdf
    • https://cdn.shopify.com/s/files/1/0451/8101/0071/files/conduction_convection_radiation_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/27106961505.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/80980388546.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/jesobewolibutoxewoxavimil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/14519620181.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/65960095098.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/58170831274.pdf
    • https://cdn.shopify.com/s/files/1/0448/4169/7441/files/caryll_houselander.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068db.bin
4f9780920be559712958e3a271c57bdab82159ac56cf5160e0e7a3c8cc917aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DB 5776 bytes
font_01_sfnt_off00007c51.bin
444397ca600acc05d1c49c15aebac314cba1d79ee3c509002f65fa554d9e65e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C51 9980 bytes

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