Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0538a4a899e476c…

MALICIOUS

PDF

64.4 KB Created: 2020-09-02 01:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf209ce257f105e58292e9809f2bc7ae SHA-1: 8480b3e89997744f9f290465419d066d85e4a40d SHA-256: e0538a4a899e476c919caefb0a3a35fcce9745a8660844f2e4ebdd14f9c1390e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=bubble+bobble+original+game
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/15723271189.pdf
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/vmware_for_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/9516211399.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/english_speaking_course_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/82749861523.pdf
    • https://cdn.shopify.com/s/files/1/0457/6863/8620/files/kitemufevokuvejugetelur.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/18008909809.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/vivah_full_movie_hd_1080p_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/leteresoxejux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/35382405704.pdf
    • https://static.usrfiles.com/ugd/affb4a_4e6bf31b67c14fc8af1d0ab4b07ee5eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2c7ec019d1240dc8bf1d6f825b46b2f.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_off00009658.bin
ae09c798d8a118abae31f63442fae28c5f0b4e09c04681d98da694e963f4f39a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9658 9288 bytes
font_01_sfnt_off0000b548.bin
027c2f2d0d03942cb66806eaf7432d2462cc431d138818ec57f1f2c402e2b4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 5016 bytes
font_02_sfnt_off0000c647.bin
034534f700a589e23dccdbb918a5d0761c400547a99160884054bf9a8adb6000
pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 14740 bytes