Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dbc90b280b9346…

MALICIOUS

PDF

57.8 KB Created: 2020-08-11 23:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0f4a8e3e6b3c5e49ba8a321e795d50d SHA-1: 221007b2686b814368bfc7ff3c1f42ccfa2d5995 SHA-256: 55dbc90b280b93462ad626574dbb86ed0714b9e2bbfcb7e0ad7c8bcded6db6cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'banking awareness'. The presence of a link farm and the ML classifier's high confidence score further support 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.ru/pify?keyword=banking+awareness+pdf+august+2020
    • http://koguzef.mmc4u.com/uploads/1/3/0/7/130775320/xofit-lisizevuk-bodiwimo-nofev.pdf
    • http://files.youngatartmn.com/uploads/1/3/0/8/130814774/a23c201fbc03.pdf
    • http://vanibazew.iditarod100.org/uploads/1/3/1/8/131871921/wezuwujolunoro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/xizok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/comment_apprendre_le_chinois.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/social_and_personality_development_david_r_shaffer.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/24309093230.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/bafg_hessen_formblatt_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/clinical_pharmacy_therapeutics.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/absceso_periapical_y_periodontal.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/buwazufaxef.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/pdf_file_to_word_doc_converter.pdf
    • https://cdn.shopify.com/s/files/1/0439/5175/1336/files/21412757662.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/55466751904.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/32881671379.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a28d.bin
d5fc9ac2064543628494194e416a78f070881140b14ba4a677bfbb9cb54d59f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA28D 5656 bytes
font_01_sfnt_off0000b5e9.bin
95e4cc22181c1a7f6fcc48fbca3f88947f8bcec56daa83a7af172282de3e243e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E9 10712 bytes