Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dc40909419ad28…

MALICIOUS

PDF

46.0 KB Created: 2020-08-07 02:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a2a41cbc108430fb49bf52d6a64f3fb SHA-1: 70da036bd8ea07c45d6b245debf41d2e5f666d2c SHA-256: 15dc40909419ad28eb57b733fdb817aa6bb42b34e25fed8d226f9e647133672b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=angielski+test+z+czas%25C3%25B3w+pdf
    • http://files.hrc-xray.com/uploads/1/3/1/3/131379266/jezisaden-dopulezasaxa-medalowo-nigufokada.pdf
    • http://files.menopausalmommyrants.com/uploads/1/3/1/0/131071289/3649917.pdf
    • http://files.theachoostics.com/uploads/1/3/0/8/130874009/1396455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/87924399785.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/63633662477.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/59786649709.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/como_hacer_un_ensayo_descriptivo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/43137995938.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/xovadopoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/industry_and_company_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8276/files/zozonekusavifizemewijepi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/43119569544.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/jisosidiket.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/probability_statistics_for_data_science_ankit_rathi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006340.bin
953aa75dd53b579d802db9527a778084da3feb6bf04eedb6eca1513959668337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6340 5236 bytes
font_01_sfnt_off0000753c.bin
7521305af556ba8edd093a23cd4e57c5917b9481419fa0d167d101b678192b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 12196 bytes
font_02_sfnt_off00009b4e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4E 4324 bytes

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