Malicious PDF — malware analysis report

Static analysis result for SHA-256 373a6cfa4a011ffe…

MALICIOUS

PDF

38.2 KB Created: 2020-08-23 11:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c512cf7a2108e82f3085a37cc738cb10 SHA-1: 6d5bc045a326411149392c73f840c5581e6d0073 SHA-256: 373a6cfa4a011ffe8a839552beb110801db1226271610465999581f8b57a2707
152 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior through a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://ttraff.cc/pify?keyword=chaita+gana+video+ing+hd, is flagged as a known malicious redirector. The document body contains garbled text and a reference to the malicious URL, suggesting it's a 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.cc/pify?keyword=chaita+gana+video+ing+hd
    • http://files.wigitagain.info/uploads/1/3/1/1/131164016/7438384.pdf
    • http://files.mrwildinghomeroom.com/uploads/1/3/2/6/132683328/nasolaj.pdf
    • http://mawefu.k-p1964.org/uploads/1/3/1/3/131380429/geraromu.pdf
    • http://files.lionsofwarminster.net/uploads/1/3/1/4/131407315/bb198e1.pdf
    • http://gobulo.ywcahealthandfitness.org/uploads/1/3/2/6/132681481/d3d4075199.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/59648810766.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/jquery_1._9_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/lenewegitasazoninovesudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/universal_serial_bus_controller.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/80365181481.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/songs_of_mzukulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/butterball_electric_fryer_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/93661829820.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/chandu_movie_audio_songs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000509d.bin
071c8dfc6c54c000514947d104d38b9e9b67fff0a87e0a96e9dcf320b1ba1474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509D 4748 bytes
font_01_sfnt_off000060b9.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 1800 bytes
font_02_sfnt_off00006947.bin
0245a6696c7873222cd2fa690ab0b90fffb45bcd5860514f23813929ff038125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 10136 bytes

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