Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8ab81bb4c5127d…

MALICIOUS

PDF

40.2 KB Created: 2020-09-01 02:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f85876e772b02c55f45ffc9fad02573 SHA-1: 5ab6c027d2d5f3d893cafc03c918fab0daa1a443 SHA-256: 0d8ab81bb4c5127d5dd238f71700028f64084999cb3985e81f875165408d132a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'free lease agreement template south africa'. The presence of multiple PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=free+lease+agreement+template+south+africa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5729/9099/files/kadekup.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/answer_sheet_50.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/arjun_reddy_songs_bgm.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/anbe_sivam_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0441/1644/3288/files/allahabad_high_court_review_officer_previous_year_paper.pdf
    • https://static.usrfiles.com/ugd/01e791_b063dcc8456a4119a720d1538f8a8fa8.pdf
    • https://static.usrfiles.com/ugd/f09a9d_994857db5f574e259a0a01b570d4a89a.pdf
    • https://static.usrfiles.com/ugd/4dd980_90a040c46cda408a967d3f8563411bd4.pdf
    • https://static.usrfiles.com/ugd/c83fdb_37f2dfb82fd84c7f8e47de18fa6e7dea.pdf
    • https://static.usrfiles.com/ugd/b8c837_e11ca8e0172f4fe2b578c08cd5c2c96b.pdf
    • https://static.usrfiles.com/ugd/b8c837_08c399fe49304148b41c4bf101ebb749.pdf
    • https://static.usrfiles.com/ugd/44b221_0c09f7941ef24d58bc5af96831d0f3c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e1b23471f6f4d3e8f2d2802ff2bfa3d.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_off00005f5a.bin
9aa8b5e84159faa58da2c5b30604d9382839cf683061c32874b2bc274d3af24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5A 5384 bytes
font_01_sfnt_off00007185.bin
947c3b6263ef0101d206e0dedb93dcae618fda6f68c1a070062aa293f022aec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7185 10088 bytes