Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b86ccd3d7e2c636…

MALICIOUS

PDF

58.0 KB Created: 2020-08-05 04:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a72bfd5cfffe0432bb647f77f17725e SHA-1: 60b027930f33ad9fffb9c0e726b0a58069b3aa16 SHA-256: 3b86ccd3d7e2c636d1a2ce55d129f7df731924e1c9f2b6fa1314dd419a90fe13
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though partially corrupted, includes the same lure text and URLs, suggesting a phishing attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a phishing attack.

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=download+light+novel+classroom+of+the+elite+sub+indo+pdf
    • http://files.rjmasters.com/uploads/1/3/1/8/131857758/lokomepowuge.pdf
    • http://files.ardenandscott.com/uploads/1/3/1/1/131163976/melusejot_guxuwugovufubiw_riziwonigaturig.pdf
    • http://files.bujinkanmedicinehat.com/uploads/1/3/2/6/132696351/56b89e7.pdf
    • https://cdn.shopify.com/s/files/1/0436/1846/7997/files/xuwevejokoxozevadonapij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/galukapoladetewepasoxemon.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/43310261407.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27039997465.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/gaxux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/22428967575.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/mozogowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/91818494835.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/teluwimamivub.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/tamimixufijud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5613/6341/files/mupugovasigodobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/suzigunuvuvoliboje.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc5.bin
dd6fb9e36c80d7d61d4910b68ac0d8b04dd3bc33fffd1955a53be051d216860d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 18580 bytes
font_01_sfnt_off00009802.bin
cf775a0e3fd1257441d81519181fe9d65881a9f60cebab41bc42258a4cd4f869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9802 5860 bytes
font_02_sfnt_off0000abe0.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABE0 1800 bytes
font_03_sfnt_off0000b46e.bin
d36028ba6c7657fa7dcbf20e8d8f4f9368a8115b4cdde4efe9fe72bc3f7caed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 10480 bytes

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