Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a33d5865eb17c03…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 04:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ef82c3bbb6808b0fef652f5cc015f0 SHA-1: 388e36f56c3228c39907ee04e9cfab9d04620636 SHA-256: 1a33d5865eb17c03e533d99bcd136f3ca079913cbf142dc459f12214b773d62b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One of the primary links, https://ttraff.com/pify?keyword=valores+humanos+concepto+pdf, is identified as a malicious redirector. This suggests the document's purpose is to lure users to malicious infrastructure through a deceptive link farm. No scripts were extracted from this sample.

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/pify?keyword=valores+humanos+concepto+pdf
    • http://files.basscoastpost.com/uploads/1/3/1/3/131378942/ef49d7008711.pdf
    • http://files.dragondistillery.com/uploads/1/3/1/4/131483002/vilexu.pdf
    • http://wiboxa.duncanranchwhitetails.com/uploads/1/3/1/8/131856380/womidututob-dukinudeduzu-zejukiwiledejad-fijemadumunag.pdf
    • http://somawevof.chalmersphoto.com/uploads/1/3/0/7/130776208/kekavejepo.pdf
    • http://files.mindofamodelteacher.com/uploads/1/3/0/7/130776592/vagexuworak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/pojufun.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2763/files/befizaruregava.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/81691715388.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/badogeduru.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7234/files/98893590757.pdf
    • https://cdn.shopify.com/s/files/1/0434/8094/0709/files/zexelomejidizebiwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/7497842503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/51346708813.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/zodadowisokusemu.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_off00006295.bin
ccc008e6e3733076015a4cb1446c0e421e6c526d637ac9f7046f1805b1afee4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6295 5360 bytes
font_01_sfnt_off000074a8.bin
1bf7fd20576cf44d7d9be0e209b3ea8e2a67badb382f27ab959d6762fc2b6932
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A8 11128 bytes