Malicious PDF — malware analysis report

Static analysis result for SHA-256 727c12684e7c5add…

MALICIOUS

PDF

105.3 KB Created: 2020-09-01 01:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f572aa6963ec28ad1eaa0a3a310dd69a SHA-1: 6cd38f0fea9949b8b8364d4a95b4b3969c264907 SHA-256: 727c12684e7c5add50d021a00259abad9aa395c5ec734a21b89c8e3634311426
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=german+diphthongs+pronunciation+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a pronunciation guide, suggesting a social engineering lure. The presence of numerous external PDF links further indicates a link farm or redirection strategy, likely to deliver a malicious payload or phish for credentials.

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.cc/wix?keyword=german+diphthongs+pronunciation+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4117a9_caf497483c024088b8f5c7a103966a83.pdf
    • https://static.usrfiles.com/ugd/850f07_e59972c1fcb24c9d8d1135d995b1a54e.pdf
    • https://static.usrfiles.com/ugd/9e53d4_80af588d27c64697bb6a72632a71bc58.pdf
    • https://static.usrfiles.com/ugd/e23fbb_9460d74e973742eab8a78f40e6e7401a.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/hand_wave_emoji.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b94b05d034940d8877c2d6facf28444.pdf
    • https://static.usrfiles.com/ugd/cc15ef_46160cac9c2545dd9f6c66fb505af63d.pdf
    • https://static.usrfiles.com/ugd/cc15ef_8bc6dbeaac1e4f45a73f062c0ff025dc.pdf
    • https://static.usrfiles.com/ugd/6c98bc_47d0cae6bd104a1a80e3ca2bda52480e.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6006/files/vimotidu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/doxotetevurevamepagilu.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133ed.bin
39a660bbc9a364417f18fee6bebfbbd01dd697c3014fa7e86cf9c79c2741995c
pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 5484 bytes
font_01_sfnt_off0001466d.bin
6e90e0929445715fad5097374c0e586558e086623c5b3d7ee87646a978b9c9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1466D 19480 bytes
font_02_sfnt_off0001822e.bin
ac2b580373fd8a0fc63e8d8cc52331fa15fd51e72a9f54970db51e3c2525fc21
pdf-font-stream PDF embedded font (sfnt) at offset 0x1822E 16188 bytes