Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d42cb2332da386…

MALICIOUS

PDF

47.7 KB Created: 2020-08-03 23:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b600acf23d7eba1729b47f8ddb7ca0a SHA-1: 8e1f1ee0200b53bf2cbf6f083ecbd64c86eb8d11 SHA-256: 20d42cb2332da386f6c819827dcf80cb57fcab00a550f24c8c00cdd48b05603b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious redirector URL and the link farm heuristic suggest a lure to external 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=investigacion+descriptiva+definicion+pdf
    • http://files.mhsmustangs4mustangs.com/uploads/1/3/0/7/130739383/revanugufow_nowirux_verez.pdf
    • http://files.modestmayboutique.com/uploads/1/3/1/4/131437276/ddaab82aa.pdf
    • http://files.cynthiastarrheartspeak.com/uploads/1/3/0/8/130814298/lunedil_bedimowapeter_didoje.pdf
    • http://zikeki.cutlerbayautocare.com/uploads/1/3/1/0/131070722/7272600.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/25279290294.pdf
    • https://cdn.shopify.com/s/files/1/0438/2379/2285/files/bozulawas.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/nikinonab.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/21260486601.pdf
    • https://cdn.shopify.com/s/files/1/0440/6204/8421/files/calgary_nw_ring_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/96099268946.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/panisigofinore.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/windows_7_product_key_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/jamex.pdf
    • https://cdn.shopify.com/s/files/1/0440/9635/6504/files/sosejufolipoxojitonixuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/1240697967.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/39285837519.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_off00007b0d.bin
90cdc9def7289ed291584cbbd825457abc8130e5ea55257fa981fa1a2b70339c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0D 5288 bytes
font_01_sfnt_off00008d24.bin
8c0464bd764d1fa3a74dbdcbc2fd880a9cc6a52d60377267afd1af9d34f7b07e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D24 10560 bytes