Malicious PDF — malware analysis report

Static analysis result for SHA-256 8863b896d8c38810…

MALICIOUS

PDF

39.4 KB Created: 2020-09-10 15:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57435a8eee9dcef70498680b790d398 SHA-1: 797f3f0caaaabd3c087907c1a8d2aed3edec3de3 SHA-256: 8863b896d8c3881026791c14cc83bf4764f3595354dbbe41322ee5387e27119c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. This suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic are strong indicators of malicious intent.

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=bhai+giri+whatsapp+status+video
    • http://files.seesawpig.com/uploads/1/3/1/6/131636655/ruxabazi.pdf
    • http://files.marionbridges.net/uploads/1/3/0/7/130776511/3395721.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e9cba9_f2b5e3db7a21433cb4658f1b8ad2bbff.pdf
    • https://static.usrfiles.com/ugd/9d869b_f9102eb05ee34fcba6e462faf3073900.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/eras_protocolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/bosisasaviwemo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2573/4552/files/gat_analytical_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/22686356789.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/adobe_acrobat_pro_2017_msi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/java_string._format_list_argument.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_off00005373.bin
f8e5b586cd7d768073e1a0674527f4c06f9b5108ab740f23ebb186ee39b0602e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5373 5388 bytes
font_01_sfnt_off000065d7.bin
b1a4fcac8c10123b4a0ae5d15a5862eebdcac9e8b8ded28295bb608cd72edfcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 2232 bytes
font_02_sfnt_off00006fe6.bin
431c319baef0914f5873fdb0f2d27f8da8f78170bdd7732549037bc5a4839ed1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE6 9664 bytes