Malicious PDF — malware analysis report

Static analysis result for SHA-256 652f38515aa0a24c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-25 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede082846dea05fbbda6c2625a0d85bc SHA-1: 539efc27910ea4a262cc6d0fa3aa45db45ea75fc SHA-256: 652f38515aa0a24cdc2cf6f1454d1d8e5d04b902acf9c0e30c7bcab0cc561fa1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), suggesting the ultimate goal is to lead users to malicious content. The ML classifier also 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=turning+fractions+into+decimals+worksheet
    • http://files.keepdivealive.com/uploads/1/3/1/4/131453592/e0b38208b324ffc.pdf
    • http://modelaw.rosemarysgardenhouston.com/uploads/1/3/0/8/130814328/pudikenakowijizikas.pdf
    • http://files.michellelewisphotography.com/uploads/1/3/0/7/130776220/bimikoxa.pdf
    • http://vunano.campbellspartanssoccer.com/uploads/1/3/2/6/132683188/nikepisu-jivabulatofubo-bijisifevozeron-ralapigux.pdf
    • http://files.resurrectionpeople.com/uploads/1/3/1/4/131483009/dulanag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6609/6806/files/zikat.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0901/files/rexojezepep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/capites_da_areia_em.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/vijenipelixozadisuxojuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/7459/2668/files/takavo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/munuminofenonar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/27295876528.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2174/files/kebedufuwije.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/telonuvekilofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3296/1443/files/bhagavad_gita_chapter_17_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/6645/7254/files/percentage_increase_and_decrease_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/best_football_live_streaming_apk.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_off00006143.bin
01e97fe9e715eb21a5514401eab62aff1f0fecb7136f74bea413709539fade4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 5540 bytes
font_01_sfnt_off000073fd.bin
38fed4c3eb273906c4df1d6dc491857736a180c09695465606520edc8c5fb965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FD 10212 bytes

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