Malicious PDF — malware analysis report

Static analysis result for SHA-256 15370bd9877dd810…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 06:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4b797752a3325c7bbe2261b1f15621 SHA-1: e5c1d12a6dc6104ed99125f485fd37a596f6c3dd SHA-256: 15370bd9877dd810ab6830bf8dd7e072ca642e18e0148d02ae2c1e93affcf130
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL associated with software downloads. It also exhibits characteristics of a PDF link farm, embedding numerous external links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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.ru/wix?keyword=modern+combat+5+apk+mod+latest+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/06497e_a77a0a744573433caa911cbeb9313afe.pdf
    • https://static.usrfiles.com/ugd/b8c837_895bc1339dad4deebd748217b346c316.pdf
    • https://static.usrfiles.com/ugd/0f5b72_7e8ae5ad1d5a48ef9c8071eb1d83ae8d.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_193af53c51f449efb52c5ffa228cd5ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_a070c81b71a24ae6b21dd10e15ed75aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/class_cp-800_mk2_review.pdf
    • https://static.usrfiles.com/ugd/89363e_556d8a386b68424b94eab959e4e66ccb.pdf
    • https://static.usrfiles.com/ugd/de3d83_6297e94a8e844e3d925ef995ebd544e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a157940a3f544febec2083513d0072b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b379de2e3ad4784b77d7e57621d9fbe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/hodgdon_reloading_manual_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/bosixawajolugowijijaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea7.bin
a2de11fce031894b6cc81ce23482f330206cdf4696480d0b3dedb0253ae09eda
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA7 3304 bytes
font_01_sfnt_off00006a69.bin
674a15b647f6f0f207601162877f3385cbd80058972dc63ea097125be32bf893
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 5612 bytes
font_02_sfnt_off00007d70.bin
1d2f71e84f1427cf69735d326789e1dab123e0becc1d231facca12816a23f71f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D70 10240 bytes