Malicious PDF — malware analysis report

Static analysis result for SHA-256 12efdc8b307ed2ca…

MALICIOUS

PDF

40.9 KB Created: 2020-08-07 05:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b147ecb9820d691d24f934062468fdc9 SHA-1: 6aa6774a25ee6a4d86a948dfb7dd394f9db37c87 SHA-256: 12efdc8b307ed2ca5e5c3d4b6925e5e8a8c7339b53538272bb0de186bc238c17
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body also contains multiple URLs, suggesting a link farm or redirection attempt. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs aligns with techniques used for phishing or distributing further malicious content.

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.com/pify?keyword=boraks+pada+makanan+pdf
    • http://files.bryantchoirs.org/uploads/1/3/1/0/131070459/damalawukeg_lejazekizarili_nevokez_sagoramofi.pdf
    • http://files.savedanyway.com/uploads/1/3/1/4/131454034/vipalutoge.pdf
    • http://files.dragongoldcup2020.com/uploads/1/3/0/9/130968921/tisawinor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/77367115793.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/17867697580.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/fifalilakaferun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/69190387699.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/51817872036.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/sevubonevozutuve.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/baluzojanatujelubuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/91514612856.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/sowejejaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/the_alabaster_girl_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/mowaminazamevo.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_off00006139.bin
1a02599b67850a801be56b88a4a27b4d2a00db30ad75f2938b7a1d76e2f32324
pdf-font-stream PDF embedded font (sfnt) at offset 0x6139 5268 bytes
font_01_sfnt_off00007313.bin
5423e37b6a9fb2a495c50aba689a80575c7bd09d2e4b1d79ce1b3aa15bc8e5a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 10456 bytes