Malicious PDF — malware analysis report

Static analysis result for SHA-256 144885d4ea8601f0…

MALICIOUS

PDF

45.6 KB Created: 2020-08-20 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c0705f0400ac7e11e29d2efde96a4ce SHA-1: 2ade1e0dd58d8bb156d465586d5690956a0f5347 SHA-256: 144885d4ea8601f03ba6589a326c7becd66757ee2bf56763cbe1faa271faa5aa
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, "https://ttraff.cc/pify?keyword=geometry+problems+with+answers+pdf", is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.cc/pify?keyword=geometry+problems+with+answers+pdf
    • http://files.northwestgrizzlyfootball.com/uploads/1/3/0/7/130775156/2702468.pdf
    • http://files.tankuanaw.com/uploads/1/3/1/3/131379612/eda4253071.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/real_boxing_games_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8502/0827/files/pasudonumalew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/15178402489.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/22314700925.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5023/files/tonexinokogen.pdf
    • https://cdn.shopify.com/s/files/1/0436/5638/0574/files/leneril.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3434/files/rinozibuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/3996980531.pdf
    • https://cdn.shopify.com/s/files/1/0434/7651/7014/files/noguzoninikilozato.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/labour_costing_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/gadabukifuji.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_off00006b83.bin
4e626d6c8b79ef0ffba33c8327ab7b196119010eaab176e1f3f3d7dcdf61d416
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B83 5648 bytes
font_01_sfnt_off00007eaa.bin
dc4ce382a0b23af39b3e330c6d41d8f64a830837f372d6bcc890276638858850
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAA 13804 bytes