Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3725e8aa76adc67…

MALICIOUS

PDF

40.7 KB Created: 2020-09-19 07:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16aaba340918283143c002ef8ad61a23 SHA-1: 7cb499cac485ca4cc83d85f1fc3814cbaf4b2f49 SHA-256: c3725e8aa76adc67c8f764e899ee1b8e79ed200b2f9ec0cd75d640a1189deb5f
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to a beach and a PDF creation tool, suggesting a lure for users to click on the numerous links, which likely lead to malicious content or further compromise.

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.me/wix?keyword=mendon+town+beach+mendon+ma
    • http://files.thehomeschoolgarden.com/uploads/1/3/1/4/131453255/tolusefowis_vojedewumawit_refumot_jegotu.pdf
    • http://virimawox.mingosmisdeeds.com/uploads/1/3/0/7/130740086/xizopudagem_kibabidat_loxitevotut_kalevilarav.pdf
    • http://rubidoto.synecdocheart.org/uploads/1/3/1/1/131164239/8157747.pdf
    • http://sobum.plausiblephotographofjosephsmithjunior.com/uploads/1/3/1/4/131482995/nawuzen.pdf
    • http://files.craftcoop.co.uk/uploads/1/3/0/7/130774993/50902a260.pdf
    • http://files.d16armor173rd.org/uploads/1/3/2/6/132695321/3972629.pdf
    • http://gagevinid.marymceneely.com/uploads/1/3/1/4/131409090/dufemedobifafelazex.pdf
    • https://eedd7326-1b53-4b66-bd8f-1d3ec218f58c.filesusr.com/ugd/4f270c_05526f447b93498d8a03c15b24e59168.pdf?index=true
    • https://6a2a3780-3549-49a0-8392-a69cf760b36a.filesusr.com/ugd/f68081_57ec5dbf23254807aad3c0d1fda044a5.pdf?index=true
    • https://1ebc06f3-b0ba-4b51-bc49-4507d40397e7.filesusr.com/ugd/d1d005_79feb2d65176422da77dc9a5f96bac69.pdf?index=true
    • https://7d797e98-6d4e-44ff-95c6-7abc4fd64948.filesusr.com/ugd/d5415a_b034a0c75c954c43a6bd04459ec7d900.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/1634/8071/files/fekafetamajini.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3645/files/56264389192.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_off00006006.bin
5c2e679b72a892b4396ac3ee378286a8bc6c1045dd88d88bb6af211c23147198
pdf-font-stream PDF embedded font (sfnt) at offset 0x6006 5108 bytes
font_01_sfnt_off0000715f.bin
5f14a1cb1c27114caae7225502fb28e6c4a4f3bb2b4b98673e074ab006eaa667
pdf-font-stream PDF embedded font (sfnt) at offset 0x715F 10784 bytes