Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99f9f10389b4fc2…

MALICIOUS

PDF

53.7 KB Created: 2020-08-24 02:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de0ff1f9619517bcaa1df75733b815c4 SHA-1: 04ffb8f94b96d196dd6a78192a95d350848eda50 SHA-256: b99f9f10389b4fc297fa48152546c404c41f52f9951eaeb726f931d15c903f5a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a phishing lure disguised as a document, directing users to malicious infrastructure.

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=ashoka+chakravarthy+telugu+movie
    • http://files.eraseair.net/uploads/1/3/1/3/131398547/tanugupabibun-xejuvan.pdf
    • http://files.daandersonlaw.org/uploads/1/3/1/3/131380279/ratogovipinono.pdf
    • http://files.madisonfirstchurchofgod.com/uploads/1/3/1/8/131856234/sitixewo_dezavisigatuw_komitejotosu_pekudo.pdf
    • http://files.madisonfirstchurchofgod.com/uploads
    • https://cdn.shopify.com/s/files/1/0453/6093/9163/files/ec_certificate_of_conformity_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/7394047922.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/ribexurepaxod.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/sulaletibebonitun.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/27337235731.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/newilujulusug.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/vefeviwomaget.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2652/files/42673197597.pdf
    • https://cdn.shopify.com/s/files/1/0437/6916/8021/files/noziwebejibosenuzitezogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1066/1279/files/vokofibijebewojexamik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ebd.bin
93e1fa199f33d166e3215237751042a3d3788014dbd5962a00ff179f0861667e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBD 5204 bytes
font_01_sfnt_off00009086.bin
189deea84c83a2f7c564a6d70c9edd73e2352c3662a4f035c30a787e16768013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9086 13520 bytes
font_02_sfnt_off0000bbde.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 4324 bytes

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