Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac9aae7e62b06b7…

MALICIOUS

PDF

36.4 KB Created: 2020-09-17 08:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 232e77c27065e14b6da37e13452e463b SHA-1: b2149140c14dab2eb21e9609be3674acf08583fa SHA-256: 0ac9aae7e62b06b7df1e1cc51e8604fa1b9f4661fc94bfc61e25f0a76be2cd9e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a link farm and malicious redirector activity, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence point towards a malicious intent, likely related to SEO manipulation or phishing lures.

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.me/wix?keyword=construction+project+management+a+complete+introduction+pdf
    • http://files.commafultips.com/uploads/1/3/0/9/130968933/nesebugitovezi.pdf
    • http://files.bamabreddoodles.net/uploads/1/3/1/1/131163705/5706947.pdf
    • http://files.osntc.org/uploads/1/3/1/8/131857334/dutivus.pdf
    • http://files.johnfishersculpture.com/uploads/1/3/0/7/130738993/abc76ee15b84.pdf
    • http://files.kspaceonline.com/uploads/1/3/0/8/130874075/zupewusilow.pdf
    • http://files.jancancan.com/uploads/1/3/1/4/131406413/sosazidisajawaj-ledosol-vaxodavuv-ziwobedomanefon.pdf
    • http://wusesu.onlinestation.in/uploads/1/3/1/8/131871921/gonupej.pdf
    • http://files.thermalplug.com/uploads/1/3/1/3/131383665/lubojudarevifoxitofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/bawoletudaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/mezzo_forte_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/dna_structure_to_profiling_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0463/5387/5105/files/66917175871.pdf
    • https://afb2ed2c-1461-4167-88c1-c7ed366265ab.filesusr.com/ugd/e2c223_1ff62570bb8e42d9b0f28be7acf70f0d.pdf?index=true
    • https://949f3076-ffb1-4fc4-9a89-9f6b5501dab1.filesusr.com/ugd/5926b4_dc81763f9d2b4b609282fb3d0a42ea65.pdf?index=true
    • https://44ecccc0-8f39-41b1-9a77-922a2d5c6f08.filesusr.com/ugd/47e66e_33fadc08650e446ca41120104b04fa87.pdf?index=true
    • https://dff0fa70-dac2-4e83-b80f-d73cf398705a.filesusr.com/ugd/2eff39_0ab88be485b8482d90b3aaf8a9131e1b.pdf?index=true
    • https://c6758cea-46f7-4847-a585-c975f1f36427.filesusr.com/ugd/622218_eeff5dd47df944569f4333cef3120b0a.pdf?index=true
    • 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_off00004f5d.bin
76a26147f123b803a436c17de89292d4912876242841f64731869fc16d0548cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5D 5456 bytes
font_01_sfnt_off000061d7.bin
46f4f9a5d2473aa0673f9399e4bbcf1575416f26afb99eb4fd6cf92ca213612a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 10032 bytes

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