Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4a3362a41f9bc…

MALICIOUS

PDF

40.2 KB Created: 2020-08-15 05:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65f23f25a9d3a42bf261f7699fa463d SHA-1: 8ff4fe1d079d6eae5d2b74c4fd19354b019a51c1 SHA-256: 72f4a3362a41f9bc73eaf23d687f5df2b4b5192ba55f0d98ece40985cbf0c510
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and algorithmically generated URLs. The document body, though partially obfuscated, contains a URL that redirects through 'ttraff.cc', a known malicious redirector. This suggests the document is designed to trick users into visiting malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=cobit+2019+design+guide
    • http://files.aspenergonomicswellnesssolution.com/uploads/1/3/0/9/130969300/9cf0dd595a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/multiplying_matrices_3x3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8711/files/4916395504.pdf
    • https://cdn.shopify.com/s/files/1/0443/4133/0076/files/css_link_color.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/mozilla_firefox_52_offline.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/auditoria_externa_conceito.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/xurofakesabirudorodipige.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/77379415585.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1039/files/tanulit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/56893356868.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_off00005f05.bin
5d4bb78d9d370d96ec6afafa8d715de47a28b865553e3f06b1d420418543bf85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F05 5180 bytes
font_01_sfnt_off000070bb.bin
772217734613f4d8772deb09b7ea4006b5a24c86cdd04d2230a77fca48ca34b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BB 10524 bytes

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