Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecc5d1b13e43965…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 04:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6839618b10e39bd2701ffffba6816d3f SHA-1: fc80609dd8399d6e7f4572d5f1a58d0dc29ad4c9 SHA-256: 6ecc5d1b13e43965478cba056cbb8c87c41100947116c09c83bc5899c1e64381
154 Risk Score

Malware Insights

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

The PDF document contains a link to a redirector, which is associated with malicious activity. The document body, though partially corrupted, contains text related to downloading an APK, suggesting a lure for users to download potentially unwanted or malicious software. The presence of numerous external PDF links further indicates a link farm, often used for SEO manipulation or distributing malicious content.

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/wix?keyword=whatsapp+plus+apk+ultima+version+descargar+gratis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b49c6_60552d2d7de84953bc63954ca6bdef83.pdf
    • https://static.usrfiles.com/ugd/921909_b4cf7752748741978a9d785cf44b26c5.pdf
    • https://static.usrfiles.com/ugd/9b33c5_98f520f2548e4d01b862e413930a5e91.pdf
    • https://static.usrfiles.com/ugd/6f7357_37988fa44f4d4898b69e0e322e40c206.pdf
    • https://static.usrfiles.com/ugd/a2d007_61dac85580834c53a7a0624f6bf108cb.pdf
    • https://static.usrfiles.com/ugd/e5a943_d3f5662d8cfe425494c6b56d39640c2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b90e902b8b4aa9ade104185c577f00.pdf
    • https://static.usrfiles.com/ugd/79e0dc_2c74e711c77c47688e24151988f025e6.pdf
    • https://static.usrfiles.com/ugd/0c41e7_ef9c6406ff4c409d92bd1ed231abb2a5.pdf
    • https://static.usrfiles.com/ugd/db1da1_daed907729924a45bb485178c44f099a.pdf
    • https://static.usrfiles.com/ugd/33c377_0cbe7a604dac46ee83d06ebf9135dd4c.pdf
    • https://static.usrfiles.com/ugd/c1de29_d780392a8a374a41afd34749d93bcba1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c32.bin
9cb28f227cf435b1bbefd237ebdb6d5781f8c2604eea52b4ac3bad03f8db3493
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 5624 bytes
font_01_sfnt_off00006f38.bin
3f66daeec011bffc822ded92feaf1721ef99df5088d34ff0c1727471d959f4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F38 9852 bytes