Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e976715b0e116e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 12:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 288d0f8cf4188f5a847ea7fe74ceddad SHA-1: 4dd3f2f34746e18b02e249d897f2d29b21499036 SHA-256: 78e976715b0e116e1319089e7870e20ad72395be3e1f6ecb53642a29e2d976de
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external PDF files, with the primary link pointing to a known malicious redirector. This suggests an attempt to lure users to malicious content or malware distribution sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL reinforces this assessment.

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=formation+ambulancier+lyon+croix+rouge
    • http://kiwobit.inspiretruth.org/uploads/1/3/0/7/130738909/wupofa_pajez.pdf
    • http://xolemox.knightwoodfrench.com/uploads/1/3/1/8/131856713/fobimazekigurero.pdf
    • http://files.localmaximum.org/uploads/1/3/1/3/131398076/mikowuwatogo_ramuzipulim_xapiki_sufol.pdf
    • http://files.findyourporch.com/uploads/1/3/0/7/130738903/6914703.pdf
    • http://files.denvermobilehair.com/uploads/1/3/1/4/131409526/4635715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/58347772429.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/33706269554.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/dudomapizuvolira.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/57511747306.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/66239663905.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2217/files/bodotivodetobufid.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/66400666770.pdf
    • https://cdn.shopify.com/s/files/1/0429/4787/0876/files/juzavipenego.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/sudimemixobig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/beribemasubapazulog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/55185935783.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_off000060b8.bin
2fa8080ff44ffbcb763d3026e1584563cf08e4dec51e3194d02152a388260782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 5204 bytes
font_01_sfnt_off00007262.bin
0fe623337bd084865f21ec55d6a0c3dd19f0ff649edcacdb5b9c1a460ee27adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7262 11872 bytes

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