Malicious PDF — malware analysis report

Static analysis result for SHA-256 806f57526a5f8bd9…

MALICIOUS

PDF

42.0 KB Created: 2020-07-29 23:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e636482787308789a6de74a766120b9c SHA-1: a95f988e77c15872c9e1a328f3886cda7f5e8507 SHA-256: 806f57526a5f8bd9a8e470e5bcec9f105b0c273e090df98b7a811fab7a0cb12f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further 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=alternative+energy+systems+hodge+pdf
    • http://files.ktncradio.com/uploads/1/3/1/1/131164199/7176043.pdf
    • http://files.bellafurworks.com/uploads/1/3/1/8/131856381/duguvat.pdf
    • http://files.rossbrownscience.com/uploads/1/3/1/3/131382274/sujuda.pdf
    • http://files.waitaraponyclub.com/uploads/1/3/1/8/131871602/db5978a401.pdf
    • http://files.kentuckycattlemensbeef.com/uploads/1/3/1/0/131070651/sakol-vozifukurubijo-xixapurofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/8736119040.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/selibisefireso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/66465302702.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/60035046600.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/57384994287.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/24060340996.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/21197394526.pdf
    • https://cdn.shopify.com/s/files/1/0429/6438/5951/files/tozupubezijewijunoviku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/doxefinofarexibuvidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/94236903540.pdf
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/kerurekulabab.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_off00005a27.bin
d914584ceb7818b637000eec0ef003315184e3990f2766ede2898222ba13a934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A27 3604 bytes
font_01_sfnt_off000066fa.bin
9b8466a71efa7154e968f464ee23f1c8627992152f26b8689b42567e52c963c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5396 bytes
font_02_sfnt_off00007927.bin
ee86f4a2ae2e181475ac78011e16dd0597ae8cf1b0b639f941f5532ada346f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 9752 bytes

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