Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d45a230ab92d02…

MALICIOUS

PDF

40.2 KB Created: 2020-08-22 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5dfafa8e4b00751efc643f87b48b1b5 SHA-1: e81556c36230c7c752027b40eab70fe25f223bec SHA-256: e9d45a230ab92d02f044e4f0e3afc81f3fc5e7ee3ac34afc4247f3d2d9b248e0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'curp gratis nuevo formato 2018' which, combined with the malicious redirector, suggests a phishing lure for personal information. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=curp+gratis+nuevo+formato+2018
    • http://files.howtocakethat.com/uploads/1/3/1/6/131607363/1390847.pdf
    • http://zetefu.monuem.org/uploads/1/3/1/3/131383936/lejedefo.pdf
    • http://files.sanantoniosalsaon2.com/uploads/1/3/1/4/131452961/jabatefalevonixuge.pdf
    • http://pawuzoje.nicoleandersonconsulting.com/uploads/1/3/1/0/131071047/bodawagikibanata.pdf
    • http://files.joetownminigolf.com/uploads/1/3/1/1/131163617/kijuzumu-sujademobezuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/fadatotema.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/free_digital_marketing_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0469/files/anand_movie_mkv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdf
    • https://cdn.shopify.com/s/files/1/0432/0369/0660/files/epson_wf-_4630_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/94658547563.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/basic_english_course_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/sixitawoziriritiweg.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/1345489887.pdf
    • https://cdn.shopify.com/s/files/1/0433/4229/9295/files/40927589483.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_off00005b18.bin
12c5a06791e677b094a40300c19e449afaa1c61a9f75305591df08b3b4e4c043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B18 5672 bytes
font_01_sfnt_off00006e62.bin
5630268ee1ad1d355d0713ad4d5eceaa77d1ce1c8f82e259f22516026568d8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 11128 bytes

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