Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f1815a561f50c9…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 23:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddc1af1eee342b012a032f5e84ed1dd SHA-1: 4c0620b91a8ed7a0432af1fb081de2b40dbba971 SHA-256: b7f1815a561f50c9e3b798d4d2edecd52e617ecccc7f72c69d632bfd80764fdd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=partes+de+un+computador'. Additionally, it exhibits a PDF link farm behavior, with numerous links pointing to Shopify domains, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wix?keyword=partes+de+un+computador
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/10648835689.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/31359154685.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/kcet_2020_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/arutunian_trumpet_concerto_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/47891432923.pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/sawojoriborebipalefuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/nekogimevov.pdf
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/sigomifupore.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/81857848564.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/zubedifugoboxeduxizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/cambridge_fce_listening.pdf
    • https://cdn.shopify.com/s/files/1/0435/7249/4495/files/katajidenogejetawimivejuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/rajomoxetumitukape.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/sofiwiguxajomamup.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9510/files/maple_v83_training_guide.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_off00006939.bin
c5b7b204f3b190ed28f889ede4572bfaa2ee411b7dedd00c3dc71608e8c85c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6939 5188 bytes
font_01_sfnt_off00007ab4.bin
9c279b0eb4b8b89e6e6c2360163e56aed087016a3bd8b0f4ab01e5e2ef9c949a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 2096 bytes
font_02_sfnt_off000083c5.bin
6b0d3a8b78d54b84a407909119a2f0ef3f563253953df8954364efbf76943b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 11104 bytes

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