Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60481e29a311af4…

MALICIOUS

PDF

36.1 KB Created: 2020-08-15 05:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196d2fac93ae95b11d209efc6686070f SHA-1: 136e6a0495f1a13557cf9d45cdd3f975c988fb7e SHA-256: d60481e29a311af4914b37bbd4e09ad2b89740877593bc4768cd2856462ab9e0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded external links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection attempt. No scripts were extracted from this sample.

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/wb?keyword=generic%20drug%20product%20development%20bioequivalence%20issues%20pdf
    • http://bedawukas.deyrecreativedesignsexpressions.com/uploads/1/3/1/0/131070487/sekokapolopo.pdf
    • http://files.jamaxe.com/uploads/1/3/2/7/132712006/00181dd999ab.pdf
    • http://rifigabow.lanesjewellers.com/uploads/1/3/0/7/130775169/gutokuj_pirujeterevipi.pdf
    • http://files.family-martialarts.net/uploads/1/3/1/3/131384573/e6e8d812c4eaa0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7207/7475/files/jemubofe.pdf
    • https://cdn.shopify.com/s/files/1/0448/0391/5933/files/come_prepararsi_all_esame_del_celi_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/sibatibitola.pdf
    • https://cdn.shopify.com/s/files/1/0437/0975/9640/files/livelerutaxuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/94239361032.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9377/files/treatment_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/asme_bpvc_section_ix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/crown_dc300a_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/89892222052.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004de0.bin
e024a8637cfb83dc175662f934cad69677f3d7841fcf431fb20cdd711f732fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE0 5832 bytes
font_01_sfnt_off000061a1.bin
a574497f28f4d70ed2d56bc3df2f86242dd5fbd1763cdb0f46b013f25c28ce8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 9860 bytes