Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd385ca6fef076c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 03:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc9f0a5d9c8f10d01552c6efecae22a5 SHA-1: 0262f3642ce50f4dcd676bf7789b3057ec5a8aea SHA-256: 5fd385ca6fef076c3f9928ea0f18f9a42dad8b98c6c4adea55d21dcb129d712b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=buffer+capacity+calculation+pdf', suggesting a lure to disguise malicious activity. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic to distribute malicious content.

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.com/pify?keyword=buffer+capacity+calculation+pdf
    • http://files.thefoxdenbridgeport.com/uploads/1/3/0/7/130739318/4582826.pdf
    • http://files.seanhuttonmusic.com/uploads/1/3/2/6/132682655/3cda6b7f4f1a1a1.pdf
    • http://files.lipsmonsherri.com/uploads/1/3/0/8/130814076/kavokagok.pdf
    • http://files.tenstringedlyre.com/uploads/1/3/1/6/131606175/tofaxanebixofap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/ravewatoperubutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/23225458182.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/22347200292.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/xatufinike.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/16108065658.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/51802728581.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0124/files/fipijorikalexip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/26113579718.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0135/files/fallout_4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/33764142774.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3507/files/60854849199.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/lefetudifaxorulamati.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_off00006cbb.bin
a3a807361a608fc2f137de3b59a0f344f8df626c3056b01e09b930936de68b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 5124 bytes
font_01_sfnt_off00007e48.bin
e0670db939ba6f946ffdb363bc1e5967fe0f6190e2f26520ad07fd84fbc114f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 10628 bytes

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