Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3b3e6a6f3c5a47…

MALICIOUS

PDF

39.9 KB Created: 2020-08-06 01:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c85003b51612fd80f50f3455d9e50efc SHA-1: ef23b34e05c266f2a1e958745ccebafcf8d58b32 SHA-256: 9f3b3e6a6f3c5a471a36a4f969e04adf8a801aa13014988461ec9b7170c3dfea
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness. The primary attack pattern involves redirecting the user to a malicious site via a link within the document.

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=barriers+to+effective+interpersonal+communication+pdf
    • http://files.hajrasouliha.com/uploads/1/3/0/7/130739839/3c4927174.pdf
    • http://files.midwestthriantarba.com/uploads/1/3/0/8/130874284/nimolabuvig.pdf
    • http://files.erinredfern.net/uploads/1/3/1/4/131437410/genud-korarov-dakiwudirenos-pesubagiduv.pdf
    • http://files.madamegeekpub.com/uploads/1/3/2/3/132303061/9924100.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/lekijiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/kexenaburunubajibiwuvopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5127/7726/files/fepasuxepapolez.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/vivapefedaxamikugixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/33039548788.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/82357814684.pdf
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/vukanezanizevex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/lenopofuriwirasuxonatonov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6120/5399/files/gowipumejanaxapefibazolus.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/wedekunomininigasuwom.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_off00006259.bin
3676ffcb857e539a2463ee88dfaa3c8794899316641ef62f7048ea8b2c3356a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 5412 bytes
font_01_sfnt_off000074b5.bin
9f5f8850e3afc2be892f9eb165f0448fd1d7e9e330936cfab5bac317fd5290fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B5 8584 bytes