Malicious PDF — malware analysis report

Static analysis result for SHA-256 635e774dc63b676c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 14:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0be5c78d487627c4b84435726ab02b SHA-1: 9261f127243558f47006a12ec1d93feea454b092 SHA-256: 635e774dc63b676cdcde387c55133056a85c397b1afd3aeaae5d8b0c4f6faa80
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text and embedded links suggest a lure related to scientific or technical information, likely to trick users into clicking malicious URLs. No scripts were extracted, but the primary attack vector appears to be the embedded links leading to potentially harmful content or phishing sites.

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/wb?keyword=determinacion%20de%20etanol%20en%20sangre%20pdf
    • http://files.helloagainboutique.net/uploads/1/3/1/4/131437376/vesituv.pdf
    • http://files.twispwellspring.com/uploads/1/3/0/7/130739772/9e7ab32b3f8.pdf
    • http://files.splashdogwashing.com/uploads/1/3/1/4/131407369/faloxutisekofupus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/lipolezatasuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/gabikedadoput.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/horario_bus_malaga_algeciras.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/87014973985.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/navabajiwojapiko.pdf
    • https://cdn.shopify.com/s/files/1/0434/3627/7927/files/22662598585.pdf
    • https://cdn.shopify.com/s/files/1/0434/6078/8390/files/zisaxiwefubogatikepog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6492/6111/files/laviwilulofezuledigipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/30439152160.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/51753685409.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/23307312493.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/11257606005.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/xitazafarumadatemabofa.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_off0000695f.bin
f4164ec190bbf9b7832e1d493452775b45aab6ca6583fc9890d864c7e84b9ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 5476 bytes
font_01_sfnt_off00007be8.bin
f2478a55d6873c934eb596d85055779935783cb7118e6aca49866437c3e0693f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE8 11452 bytes

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