Malicious PDF — malware analysis report

Static analysis result for SHA-256 03218fceffcadabc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 21:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e64b38b686dfdc03fe674c0f2b9f90d SHA-1: 59e5299b30987369e8b751fe25fa80c4b2311ac0 SHA-256: 03218fceffcadabccf22c8eb50276d583bd7b8b18b56def214ce35a6fa22b499
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating an attempt to lead users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam attempt.

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/pify?keyword=android+tivi+box+n%25C3%25A0o+t%25E1%25BB%2591t+nh%25E1%25BA%25A5t
    • http://files.sugarrushcustomcreations.com/uploads/1/3/0/7/130739809/pejajepisom.pdf
    • http://sudor.pgtool.com/uploads/1/3/0/7/130739980/suliweduf.pdf
    • http://gaguvu.holt-art.com/uploads/1/3/0/8/130813095/jepesemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/mobefugelezojolepasixa.pdf
    • https://cdn.shopify.com/s/files/1/0447/7770/1533/files/cover_letter_for_job_application_in_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/92160044751.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/house_hunting_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0437/3043/6247/files/69342961357.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/descargar_calendario_2020_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/86490146382.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/91463594617.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_off00005ff7.bin
9831d4cd42f606a4215456b8116afc9d3917ea4145d8daaa4e93bfbeb7b0b37c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF7 5404 bytes
font_01_sfnt_off0000716f.bin
9c53351fa03a16d366ae80f1664a6cb25981f41a4702baf0cab243df3a6f52f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 10540 bytes