Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f0f016e21fe586…

MALICIOUS

PDF

41.5 KB Created: 2020-08-11 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6f469d537d81713987501429d76a224 SHA-1: f390d63ab16cbc449e89c5fe2bc5254e1623198e SHA-256: 15f0f016e21fe586796c2b4bcb1d3162f3e4491cedfee216aeaa9900ed4face7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to appear as a free converter, but the primary URL leads to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a SEO poisoning or link farm attack. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=pdf+to+word+free+download+full+version+converter
    • http://files.ambatilab.com/uploads/1/3/0/7/130739864/4374196.pdf
    • http://zikuze.firstloveradio.org/uploads/1/3/1/6/131607240/wixefufumosobit.pdf
    • http://jotonakal.pineridgeretreatcenter.org/uploads/1/3/1/6/131637814/262582.pdf
    • http://files.goodshepherdgratz.com/uploads/1/3/0/9/130969075/miratov-kekezoxagomaga-jebejuwovosive.pdf
    • http://files.australianworkersparty.org/uploads/1/3/0/9/130969923/6164931.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2685/6601/files/calamities_renee_gladman.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/winapodanurazud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/in_search_of_lost_time_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/wilupuganasonexaridopimam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4815/files/xejidegabuvameboseresi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/bapasesutufakobifimodib.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/concepto_de_aldosterona.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/jaxuvivejogof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/20078996962.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/bajimon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/blackout_breathe_carolina.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_off0000659a.bin
ad927e1f56a3ccb70172d5f0b566aa7e2988e37e22383b9409b4594e2e9aa13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659A 5168 bytes
font_01_sfnt_off0000774d.bin
b1e1520909ba527e401c33a618a80591f06b04e4ca06613fdee4f793c3342a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 9860 bytes

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