Malicious PDF — malware analysis report

Static analysis result for SHA-256 878130ab60e5dfc8…

MALICIOUS

PDF

65.2 KB Created: 2020-07-13 22:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132dff136cf216a254f6a658a89319d7 SHA-1: ddf351d23b9457c7d3f5bd1a2f354efdcbff9579 SHA-256: 878130ab60e5dfc8b807b50d7422b633122525f08968229cfbdc75f4c30ddc0d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary link identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, but the extensive malicious linking is sufficient evidence.

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.com/wb?keyword=nodal%20analysis%20pdf
    • http://files.londonlivefitness.com/uploads/1/3/1/8/131856649/3598330.pdf
    • http://files.tectonichospitality.com/uploads/1/3/1/0/131070612/5949657.pdf
    • http://files.knottydesignco.com/uploads/1/3/1/4/131407539/8155872.pdf
    • https://segokowiw.files.wordpress.com/2020/06/fidimolev.pdf
    • https://desikamen.files.wordpress.com/2020/06/munopefixarugasorifil.pdf
    • https://bojodexiwow.files.wordpress.com/2020/06/rotokijowujuzot.pdf
    • https://mudopepomof.files.wordpress.com/2020/06/bowurusen.pdf
    • https://natasozijum.files.wordpress.com/2020/07/3006246005.pdf
    • https://sarukesap.files.wordpress.com/2020/06/27678046091.pdf
    • https://ginirosidu.files.wordpress.com/2020/06/zezakepofezu.pdf
    • https://meboraxi.files.wordpress.com/2020/06/92785561065.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/webonubamovupip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/luxenetomelirif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zilifevuzumojewod.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/linigajuzipematedokemurar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/49964998047.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/86341787882.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb12.bin
6aca2006452832233bc85422906be71ede9f1d9153874a3986b75c420871a290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 4600 bytes
font_01_sfnt_off0000cac5.bin
64509f046edffa8b1ebc825c0ef1061d6bb03624e6c3ac45b4a409af42f1a66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 14124 bytes

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