Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde040c2c1e6fa90…

MALICIOUS

PDF

33.2 KB Created: 2020-08-08 21:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52fe4a95afb421a9c1ac61190fc196c SHA-1: 5601e93ab1dbf96fc27976a5ca17f690c908b13b SHA-256: bde040c2c1e6fa90bd23a123798ca184f0437531c1a5dba29bf67bcf9f5c1541
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to potentially malicious redirectors like 'ttraff.ru'. The document body, though malformed, includes the same academic title as the redirector URL, suggesting a lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing numerous SEO-optimized links, likely to distribute traffic to various destinations.

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=introduction+to+commutative+algebra+and+algebraic+geometry+kunz+pdf
    • http://files.honouringourbundles.com/uploads/1/3/0/7/130776033/kisolutefufimuw.pdf
    • http://nixove.revartcolorado.com/uploads/1/3/1/4/131406390/bigodoxajovidebijed.pdf
    • http://files.811x.org/uploads/1/3/1/4/131406234/radumixukelobi_jivovasow_pafozu_jurujos.pdf
    • http://files.cunyhpcs.org/uploads/1/3/0/8/130874655/tigegeroperu-pojududexopidi-wopubiduja-rolok.pdf
    • http://files.koehlerchronicles.org/uploads/1/3/1/3/131379040/673154.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/brisbane_suburbs_map.pdf
    • https://cdn.shopify.com/s/files/1/0439/7875/2158/files/kimezajimijudolumegaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/87710511387.pdf
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/building_the_analysis_model_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/kokugegizagedawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/74200976309.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/papexarerexeturaroz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/ableton_live_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3750/8252/files/ssr_125_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/show_wifi_password_android.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_off00004624.bin
a0b7eae9daf7d27d7677a8ea3e319764c77a1eedf111e041406b9b688072d55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4624 5652 bytes
font_01_sfnt_off00005959.bin
c5a57dc826f30a80795d73cd927aea9821da010678fe8dd3c1ce7a01ead984c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 8700 bytes

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