Malicious PDF — malware analysis report

Static analysis result for SHA-256 882311aa58d2f993…

MALICIOUS

PDF

32.5 KB Created: 2020-08-25 13:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ea2c7f3732fd9b0a870cebb9195418 SHA-1: e52f435af42f06f505d3945ecbd573f9aefae2a0 SHA-256: 882311aa58d2f9937788569913c30e05aed7c0277ceb2dffb307502951108e6b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=avast+internet+security+definition+update`. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a spearphishing attachment leading to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=avast+internet+security+definition+update
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3141/0326/files/gavekevisasebapijer.pdf
    • https://cdn.shopify.com/s/files/1/0434/6088/6694/files/89306112783.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/academic_reading_and_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/lefof.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/95923085711.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/painter_s_algorithm_in_computer_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0440/2659/3445/files/68422267386.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/raul_prebisch_dependency_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/amsterdam_tourist_map_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/38685437431.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/vesesafema.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_off0000430c.bin
c5cd8d2ef0754907e25d7c7199d9c99118c72c169ac46f011d3fa3b8599dc31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x430C 5268 bytes
font_01_sfnt_off0000550d.bin
6f9ac58f1b09bbf454b0d183f12c0edb4cec9a981a8d7c1273dcd6daaa3bc61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550D 9528 bytes

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