Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6bb959c74e49f4…

MALICIOUS

PDF

33.5 KB Created: 2020-09-17 13:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334bf9ff23a7a53b0401a3872a8af3bc SHA-1: ddd3adb1ec90671798f3d529fda284309699a7a5 SHA-256: 3b6bb959c74e49f495f02c40fd7d6b8fa9fd8b386da04d894a31e51662c2366a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector link, both pointing to potentially malicious infrastructure. The document body text, though garbled, contains references to "Bbq and foot massage remix" and the malicious URL. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be a lure to click on a malicious URL embedded within the document.

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.club/pify?keyword=bbq+and+foot+massage+remix
    • http://files.kitalerafiki.com/uploads/1/3/2/6/132695575/zulisepa-fasef-pijebewok.pdf
    • http://wutodula.talariusgaming.com/uploads/1/3/1/3/131378970/vevatupise-wukixi-gorufelijetivet.pdf
    • http://files.wachurchofchrist.com/uploads/1/3/1/6/131606491/jubabuvovo-zevamapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/53320859633.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/jazonevupukapovaruta.pdf
    • https://cdn.shopify.com/s/files/1/0429/4259/5239/files/bridgestone_turanza_quiettrack_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/sinep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2711/files/23442339809.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/gitufawufiramupo.pdf
    • https://5cf32fc1-4847-4801-8541-f718b8fc29e2.filesusr.com/ugd/3be48b_57c46333dfc147fe90a8be50efd22718.pdf?index=true
    • https://cc38f40e-dc8c-44d3-a5b8-246cffeb4528.filesusr.com/ugd/08fe48_ebc86d20987547618cc106180e8495ed.pdf?index=true
    • https://975b3af0-3e66-4a0b-9dfc-ead51e3a2e40.filesusr.com/ugd/01d500_f1469ab18abd4f98a9b918997022cfb4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004492.bin
3ed2b539371395f79a4d0f0eeeebe9f393d86c0b64dcb53aac727f2e3385f23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4492 5580 bytes
font_01_sfnt_off00005773.bin
d6d12b513c86db5f43b0f612caceb426158aaaa9cd61333708ce248c808ee408
pdf-font-stream PDF embedded font (sfnt) at offset 0x5773 10016 bytes