Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc90473131afaa6…

MALICIOUS

PDF

40.1 KB Created: 2020-07-30 15:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3a1a8280c9cf2885dd1f1e4b0e1f93 SHA-1: d12804a200fd998569b1fe63b6ed035b39b5a256 SHA-256: 0bc90473131afaa64e87eddd9345f4dc69d153293ef18c70d2260fe951ea72cf
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or unknown external sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the use of 'ttraff.cc' for redirection, indicating a malicious intent to lead users to harmful content. The document body, though heavily obfuscated, appears to be a lure related to academic papers, likely to trick users into clicking the malicious links.

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.
  • 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.
  • 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=elementary+abstract+algebra+examples+and+applications+pdf
    • http://files.globalcitymission.org/uploads/1/3/1/6/131637313/pusen-jiziz-govuwuri.pdf
    • http://files.protectivebehavioursconsortium.co.uk/uploads/1/3/1/4/131407459/78a21c.pdf
    • http://files.liscenter.org/uploads/1/3/0/7/130774979/lizoluvidawaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/negibaguritamikeri.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4313/files/90904180068.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/noloxov.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/dalitopomotubolazarafija.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1873/files/xixuwiguno.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/rusoka.pdf
    • https://cdn.shopify.com/s/files/1/0438/1779/5741/files/29494094638.pdf
    • https://cdn.shopify.com/s/files/1/0437/8070/2366/files/sukubagile.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/bowaxigojaguta.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/73955448585.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/45805757590.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/16009416065.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_off00005e2f.bin
07c55211a85c1f07995e009b1857ba0984a7a8338032eee1072d0f19177158c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2F 5528 bytes
font_01_sfnt_off000070e6.bin
6fa8648020e0d46d52fcc152a539993696ebc38a0d70a841bfe75b63929e92c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E6 9980 bytes

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