Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0165b7f85cfe32…

MALICIOUS

PDF

55.4 KB Created: 2020-09-10 00:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94742a267eaafebc424e15229cd5158 SHA-1: b03d7cc9fe386f8f8c75fb62e5c6adef60c91c04 SHA-256: ab0165b7f85cfe3211a077ebef5930c8e0caa7f0a0afb4b1efbbfdeef747cfc8
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, many of which lead to suspicious domains and one is identified as a malicious redirector. The document body, though partially corrupted, includes a URL that is also present in the embedded links, suggesting a coordinated effort to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=peso+corporal+definicion+medica+pdf
    • http://files.klehmannphotography.com/uploads/1/3/0/7/130776641/jumemeguneseja.pdf
    • http://veladuf.texaspremiuminspections.com/uploads/1/3/1/4/131407164/xuratabinolekaxej.pdf
    • http://files.labamboovixen.com/uploads/1/3/1/4/131406153/5f130e7043c111.pdf
    • http://files.emmausseries.org/uploads/1/3/0/7/130739678/menugoresusop.pdf
    • http://files.sacredheartfc.org/uploads/1/3/0/7/130740174/pemixumol_ketenokowemagi_nabozi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/chiari_1_malformation_symptoms_getting_worse.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/89150592229.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/i_can_t_hear_people_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/braunwald_cardiology.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/34676585171.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/como_calcular_grrf_na_conectividade_icp.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/liver_function_in_digestive_system.pdf
    • https://static.usrfiles.com/ugd/01bc73_83c87d9ca6bd4aa9a3a998e3f182cdad.pdf
    • https://static.usrfiles.com/ugd/b5472a_5bde49d5e4a74aa0bd279722d3ab16c9.pdf
    • https://static.usrfiles.com/ugd/432b07_a001536822e345fc9740e1fe06f7e751.pdf
    • https://static.usrfiles.com/ugd/837d34_cd16623b657e446e8883134ac3e98fae.pdf
    • https://static.usrfiles.com/ugd/b444d4_e032acdfe89546cead884de19d16d5ed.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_off00008a71.bin
77ff45cf0f44c1904ec1ad91951dfeb1c1e843a730f2c723f297245f8a456c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 5300 bytes
font_01_sfnt_off00009c65.bin
a9760c2395d99b43b30adcef9231ceb41b11d1febb234da4ccc8acdc00856321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C65 17152 bytes

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