Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c2189381f0ea0c…

MALICIOUS

PDF

44.3 KB Created: 2020-09-19 10:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef819d566ca199b6f006f40015d0b508 SHA-1: a659a52b49e0db7262895a5faa97f220eb8c0030 SHA-256: 25c2189381f0ea0c3eebde83bc7c63fe823ef971c79c4fbf5d178fddb67d9e6e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. This suggests the primary purpose is to host numerous external links, likely for malicious redirection. The presence of a known malicious redirector URL further supports this. No scripts were extracted, but the sheer volume of links points to a delivery mechanism for phishing or malware.

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.link/wix?keyword=happy+new+year+2017+pictures
    • http://wutuv.neurotherapycenterva.com/uploads/1/3/0/7/130776394/lutoba_sitazosonosuwa.pdf
    • http://jowomexiv.murrayfreedomfestivalne.com/uploads/1/3/0/8/130814408/4246292.pdf
    • http://files.midcopw.net/uploads/1/3/1/8/131872178/866f98266.pdf
    • http://lajivelap.artebom.com/uploads/1/3/2/6/132696067/3972911.pdf
    • http://somufalin.gotnlc.com/uploads/1/3/1/4/131406665/kotebeb_kesufevepalivij_xurul_feburikudava.pdf
    • http://files.rachelhoblitt.com/uploads/1/3/1/6/131637919/jekovivata-wusiwu.pdf
    • http://files.holycow.studio/uploads/1/3/1/0/131070506/voxamixajejuweti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/32376790897.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/20780317256.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/98225612141.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/zesazidirifawijife.pdf
    • https://245ef555-fcd9-4072-9631-c539beaf835b.filesusr.com/ugd/64bd79_6450c5ac91284029a64a5403a2143105.pdf?index=true
    • https://599f67a4-19f0-445d-8df8-ed821a11a3db.filesusr.com/ugd/f523c3_32987e47e82e43cdb57f1c54f4f588f4.pdf?index=true
    • https://1660abbf-612a-4080-8dfa-8df8cce7d930.filesusr.com/ugd/4aae87_cb75ef9811b745d4a3dc39aa36ffc3db.pdf?index=true
    • https://66a2e4ff-f420-400d-97b7-1c9c9732d322.filesusr.com/ugd/607883_b00350a40c8640a884c42fe7feae27c2.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006344.bin
3eea95c657ff10323e488524ce427da235852de3534806e5d7fe1ca4ca90567e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 5456 bytes
font_01_sfnt_off000075fb.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 1936 bytes
font_02_sfnt_off00007f3e.bin
cb9f94c25ecdabee954e5b70973bca38f4e3ea90aaecdaf8809c1b1975ef596e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3E 10740 bytes

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