Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5869e68a44afdb…

MALICIOUS

PDF

73.1 KB Created: 2020-07-29 03:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f2132a83d6c2a9127d4d93e1c3c74f SHA-1: 0593d7b8dc7aeddbae1f8405a76edaf1adb4335b SHA-256: 0e5869e68a44afdbc13d01b23e0307fa84105076a8f5e8d2d1d81831e2590da2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links strongly suggests a phishing or malware distribution 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.com/pify?keyword=worksheet+atoms+isotopes+and+ions+answers
    • http://files.bloggingwithbray.com/uploads/1/3/1/4/131437832/jafetabiluwixekox.pdf
    • http://files.janda.services/uploads/1/3/1/6/131606475/tuvosar_bazisavune_piforesovop.pdf
    • http://files.lamaskungfu.com/uploads/1/3/1/8/131856041/6976260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/48229727880.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/51080633033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/6707146421.pdf
    • https://cdn.shopify.com/s/files/1/0441/1644/3288/files/21323319746.pdf
    • https://cdn.shopify.com/s/files/1/0429/3319/0823/files/89443319333.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/pukatisomaxixeselagesowil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/vafijuwexivuguk.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/vuwasunegegosojinulefef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/zozowag.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_off0000e1d0.bin
0990fbd18c5cfd921d86018fc2d79c6c8362c6f1836dfd0b079dc7c47f993505
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 5124 bytes
font_01_sfnt_off0000f327.bin
73c43f441a69e2cf8eae6ee64ed77afdb6333a219b9bc8f744f00e3725834768
pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10508 bytes