Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e917acfb8d6eb7…

MALICIOUS

PDF

39.1 KB Created: 2020-07-09 11:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: b1461f27f9642581c1aba9a0d9f2d2d7 SHA-1: 19f15e673e2df1377fd566157de221c2d345a8f7 SHA-256: f2e917acfb8d6eb7c6cf0d7dde6a93f0276b8ec26833282df36fd678d8904167
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one prominent link redirecting to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body text, though partially garbled, contains keywords related to the embedded links, suggesting a lure to entice clicks. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=manual+bottle+washing+machine+for+sale In PDF document text
    • http://files.sigmakappaomega.com/uploads/1/3/0/7/130775907/e36495.pdfIn PDF document text
    • http://files.wesleymerced.org/uploads/1/3/1/8/131871785/40b69e0782f73b1.pdfIn PDF document text
    • http://files.balancewithreikifredericton.com/uploads/1/3/1/4/131452880/tamawulixal-rizizaxobofo-noroxawodunuwew.pdfIn PDF document text
    • http://files.airmicrochip.com/uploads/1/3/0/7/130775902/nenexim.pdfIn PDF document text
    • http://files.rockingcleatherandboutique.com/uploads/1/3/1/3/131383510/7375545.pdfIn PDF document text
    • http://files.mhecblacon.com/uploads/1/3/1/4/131437351/vasak.pdfIn PDF document text
    • http://files.zbmtwest.com/uploads/1/3/2/6/132682561/zuveponiz.pdfIn PDF document text
    • http://files.priestrivercommunitychurch.org/uploads/1/3/1/6/131637695/xaxobokajalusokutuvu.pdfIn PDF document text
    • http://files.megancrockett.com/uploads/1/3/1/8/131856518/91ae79d7607.pdfIn PDF document text
    • http://files.brittanyritter.com/uploads/1/3/1/4/131483154/rumisazenugelak.pdfIn PDF document text
    • http://files.louisabrownholistictherapies.com/uploads/1/3/0/8/130874458/5292551.pdfIn PDF document text
    • http://files.communityland.org/uploads/1/3/1/1/131163957/libawonowubava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://napipivo.files.wordpress.com/2020/06/lugiremagigiwu.pdfIn PDF document text
    • https://bilebapajaji.files.wordpress.com/2020/06/foxefujasenij.pdfIn PDF document text
    • https://fufedep.files.wordpress.com/2020/07/malalifagibugitadizexil.pdfIn PDF document text
    • https://lopititixuv.files.wordpress.com/2020/07/38859135474.pdfIn PDF document text
    • https://vuxatuwubi.files.wordpress.com/2020/06/kuponilekekowudekidelow.pdfIn PDF document text
    • https://difimedo.files.wordpress.com/2020/06/dalaxixizesebakoderule.pdfIn PDF document text
    • https://wiwifidu.files.wordpress.com/2020/06/49936702093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vukanuzedatijaxugevune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65431134640.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B48 5416 bytes
SHA-256: 5d284b36c22439ef9bbd3489c05266e926a7a64ff4e96d9af243e818e31646e1
font_01_sfnt_off00006d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 9864 bytes
SHA-256: 3f3faa66b1823cbb49a015e939d03a2f9c3c007e67c088450478cc084d0c3ba5