Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c6cf7022eb9875…

MALICIOUS

PDF

41.6 KB Created: 2020-09-09 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 181731e9fbeef1cc166004a87414d212 SHA-1: 227399dc7a81494f0a1232539170b294e6481f0d SHA-256: 71c6cf7022eb98751ab3c6b2d63ff04038291583975c51d8a611caef4af24959
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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.link/wix?keyword=spanish+placement+test+study+guide+utep
    • http://files.banksminiaturehorsefarm.com/uploads/1/3/0/7/130775396/wiwaxade.pdf
    • http://rotelama.riittakuisma.com/uploads/1/3/1/3/131398362/8024229.pdf
    • http://files.leaderboxessentials.com/uploads/1/3/0/7/130775172/1436979.pdf
    • http://files.lourie.co/uploads/1/3/0/7/130776490/2e1fa2b22520a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6538/4861/files/morphs_and_allomorphs.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/81148721305.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/30708276971.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/87189415552.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/xoroto.pdf
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/badozudumibefegotuvopojus.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/raxolodizipapovif.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/dugawagesawafawosugolurow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/florida_boating_course_exam_answers.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_off00006326.bin
61a91af3aa4730185388946f0a0f9c0f5923d8014a8482db7fd6bbf1165b35a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 5596 bytes
font_01_sfnt_off00007614.bin
bc2f27c9298a91c64f6f491ffd7047a7e93a60573f857d66b40f2ea96cbc807d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7614 10400 bytes