Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c52da55e19141e…

MALICIOUS

PDF

35.1 KB Created: 2020-08-15 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe7b52d41f55823b5d936fc8e888a452 SHA-1: bb514fcf60e9b292a475f78c29750f7dbe0a675c SHA-256: 74c52da55e19141e6444fa0aa2d587eb353e62ddb5c3995056a9a44662340a80
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically to `https://ttraff.cc/wb?keyword=bedside%20clinical%20examination%20pdf%20download`. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files. The document body, though heavily obfuscated, contains the same malicious redirector URL, suggesting an attempt to trick users into downloading a malicious payload or visiting a phishing site. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or malware distribution attempt.

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.cc/wb?keyword=bedside%20clinical%20examination%20pdf%20download
    • http://files.maleyrie.com/uploads/1/3/1/4/131438069/walopaxudifed-resezaga.pdf
    • http://sukezik.sjbcatholicschoolredbud.org/uploads/1/3/2/6/132680813/bupowu-wavedelofaz-sozunekevu-tujizuzi.pdf
    • http://files.stonechenlab.org/uploads/1/3/0/7/130739204/7401836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/mexico_barbaro_john_kenneth_turner.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/nulet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0975/3767/files/xujusuza.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/history_of_the_catholic_bible.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/27790099699.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/dozomikabopinosuzusipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/26132784684.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/radiata_stories_iso.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_off00004bb2.bin
070290345c8e588fdb6d7c0aff22e0f9b9961b0d0728ff853b6ac248f9bd5ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB2 5416 bytes
font_01_sfnt_off00005e24.bin
87dc9f6d7cdd0d0f116db5f85181f5b9edcd5ea5ed4cf888c33d222d5892a203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E24 9888 bytes

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