Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc91aa39e6192db5…

MALICIOUS

PDF

49.2 KB Created: 2020-08-06 12:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb88104b9ec7b35f1f34744ae3bcad80 SHA-1: 7d2e8f92226a97455a6bd4a6f99382bda4bdf097 SHA-256: fc91aa39e6192db5634527a9799a1a098c5c33a4abbec17d81f11b5354ddc6e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm or SEO manipulation, with numerous embedded links pointing to external PDF files. One of these links, https://ttraff.ru/pify?keyword=calidad+y+equidad+educativa+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure.

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=calidad+y+equidad+educativa+pdf
    • http://tirakukev.nuwage.net/uploads/1/3/1/3/131381464/dupasugefevubeb.pdf
    • http://files.willdabeastmusic.com/uploads/1/3/0/8/130814680/niruvixedekiguxet.pdf
    • http://kuxuri.noahguystaffing.com/uploads/1/3/1/3/131398455/xisugawizixelogisema.pdf
    • http://files.goldentreasureretrievers.com/uploads/1/3/1/3/131398252/2918990.pdf
    • http://files.jeanisaacson.com/uploads/1/3/1/3/131381363/jiruj_motov.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/fazik.pdf
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/speer_reloading_manual_14_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/7122/1410/files/tablas_de_multiplicar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/4874394650.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/86782390789.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/programming_the_world_wide_web.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/34944916832.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/70957209591.pdf
    • https://cdn.shopify.com/s/files/1/0437/5307/8933/files/patikizosigotuwuzolazijej.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/67790048216.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/gapirebir.pdf
    • https://cdn.shopify.com/s/files/1/0435/6816/9121/files/28999812017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/emerging_trends_in_human_resource_management.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_off00007f1f.bin
b0a876e357c2c40c11cada93a81bc44634350cb954c4add746691fdbe53aa393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1F 5068 bytes
font_01_sfnt_off00009081.bin
234e7b7b0299eb85e13725040d15d5410bdf44101b5312a6a6d764dac53a9651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9081 11552 bytes

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