Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae11f74791f0eaf4…

MALICIOUS

PDF

43.6 KB Created: 2020-08-04 16:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd220f5e20f184a5210f895bd7f2e0ff SHA-1: a6015619bc4a6495e3e6d6a278293257960b2cca SHA-256: ae11f74791f0eaf4866796b91f993fa7c0751e8c7252085b3464ee59c416beb2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.cc/pify?keyword=stammbaum+buddenbrooks+pdf, which is known to lead to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed to lure users to malicious sites.

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.cc/pify?keyword=stammbaum+buddenbrooks+pdf
    • http://xugapi.vivalaglamnails.com/uploads/1/3/1/1/131164239/sazig_kalibuselerapo_muzik.pdf
    • http://files.ministerdebweddings.com/uploads/1/3/1/3/131379060/nurubotezu-zugebasupisobe-fobivizujan.pdf
    • http://files.teacakeandgaming.com/uploads/1/3/0/7/130739712/6938523.pdf
    • http://files.cheeselouisefoods.com/uploads/1/3/1/1/131164460/d66bdf0.pdf
    • http://files.glendalekfss.com/uploads/1/3/1/3/131379951/jozepojulizitul_fifirupibe_dijarutosufato.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/minowotem.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2589/files/37499432640.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/24140195748.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/livefonositivaserus.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/jadomunibavinen.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/87668824724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/94809603516.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/75897568881.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/auto_body_repair_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/33987600518.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/kidenezefus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/kumut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.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_off000067f5.bin
1863659d0c1cb1d9ed3fe663c174b28eaace3c31658ed5622a3cc55329c4aad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F5 5460 bytes
font_01_sfnt_off00007a6d.bin
65b7e8b34225ea5ed2907d551096fe5b67c68361f044503980574460891be854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6D 12424 bytes

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