Malicious PDF — malware analysis report

Static analysis result for SHA-256 0201ff0ededdac85…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 09:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e938dd1583317fc86b7ffa8e78b468be SHA-1: 7d13b0b738e4b68ec050d8fdc874f8e105550416 SHA-256: 0201ff0ededdac8520b87bb202f2ac71ca189b8236bcc4f454c829e903b70fcc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Converting decimals to fractions worksheet 4th grade' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

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=converting+decimals+to+fractions+worksheet+4th+grade
    • http://domala.vertimu-biurasvilniuje.eu/uploads/1/3/2/6/132681670/4a2d5d2414.pdf
    • http://files.14thandmainchurchofchrist.com/uploads/1/3/1/1/131164310/gatovikido-pegetimudenazit-ximefefuwipe.pdf
    • http://files.asiawomensconference.org/uploads/1/3/0/7/130738607/nofakim_fovot_fevakaxip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/lazejugodafitepitararujek.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/98718809396.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/38556587833.pdf
    • https://cdn.shopify.com/s/files/1/0430/5171/2666/files/6_agents_of_socialization.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3650/files/24224727769.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/46443104250.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/8987261219.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/flyleaf_new_horizon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/53018038742.pdf
    • https://cdn.shopify.com/s/files/1/0451/6475/7146/files/carmina_burana_choral_score.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/radodovisanare.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f10.bin
c6ae13cad6806f8ef03f98b79dec2471f80d0e9ad75906d990ef64e1b9d3dc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F10 5644 bytes
font_01_sfnt_off0000723d.bin
fa3a9b353a9f67371b150b57b9b5a1f31b2826d3eee1300c75a8db1dfdab194b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 10212 bytes

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