Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba8175c1d32d9c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-04 10:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73d58183f020875c31c644522459800c SHA-1: 8798c0b943cffe80c6aab968b2bdf936d61fd8a7 SHA-256: 5fba8175c1d32d9c9527c3ebbd0db53b3504d74e872d08ee116225c28ae22dff
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 ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body itself contains a URL that appears to be part of the malicious redirection infrastructure.

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=aha+cpr+guidelines+2020+pdf
    • http://files.missliane.com/uploads/1/3/1/3/131379540/borojuwiti_vunojad_zexanonedumove.pdf
    • http://files.mcsocp.com/uploads/1/3/1/3/131397934/8073750.pdf
    • http://files.tacaairlines.ca/uploads/1/3/0/8/130814510/4506530.pdf
    • http://files.sherwoodparklaserclinic.com/uploads/1/3/1/1/131164479/24bff2a8.pdf
    • http://files.aroundtheworldkitchen.com/uploads/1/3/1/0/131070561/tudig_fomikapax_zevajotixovunep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fukiwifetesiwesuxupaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/scala_functional_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/sao_light_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/3573290075.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/zunipuvumefojiparomenitis.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/93589218826.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/bexujenefazebufol.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/74854317655.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/9115229771.pdf
    • https://cdn.shopify.com/s/files/1/0437/5307/8933/files/nilusujimebuluweterowev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/vewokudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4663/3621/files/jomuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9150/files/jinulapo.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_off0000670b.bin
fe94d20fe8ccbe15f78ac353b952a9c57b6f9ed2669fd410703ee854052c5c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670B 5680 bytes
font_01_sfnt_off00007a54.bin
e4f2284291aa99e62ecb2b4aa7b4651a7682e532bbabecce967599d36e7749a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 10136 bytes

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