Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b08a586a71fb65…

MALICIOUS

PDF

35.6 KB Created: 2020-08-17 02:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71e1b662295a9ff6b8395cf4ae7d7ff SHA-1: b921b8b5d110372e4c876e0645ead241ee13afa9 SHA-256: 43b08a586a71fb651fa716fca1d8373967562d72ca6afca1f9951d957dca45b1
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, including one to a known malicious redirector, suggests the document's primary purpose is to drive traffic to potentially harmful sites. The document body text, though partially corrupted, contains keywords related to software downloads, reinforcing the lure.

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.cc/pify?keyword=synaptics+for+windows+10+64+bit
    • http://files.massagetrainingbaltimore.com/uploads/1/3/1/6/131607029/4f02aaba1b6a4ae.pdf
    • http://files.risingnorthproperties.com/uploads/1/3/1/3/131380729/gixotowatoxez.pdf
    • http://files.theflowersareburning.com/uploads/1/3/1/4/131406827/fadilawotugoj.pdf
    • http://files.executivecrestrealty.com/uploads/1/3/0/8/130814192/a0ffc1d.pdf
    • http://files.aldwinlauron.com/uploads/1/3/1/8/131871501/be4823d.pdf
    • https://cdn.shopify.com/s/files/1/0428/2803/8310/files/jurarosabebixawinar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8437/3406/files/how_do_you_type_a_smiley_face.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/akademikong_pagsulat_halimbawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/materi_biologi_sma_kelas_xii.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/85210041739.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/antigone_jean_anouilh.pdf
    • https://cdn.shopify.com/s/files/1/0432/9468/7400/files/lukobofid.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_off00004eaf.bin
dcfd8baff8a0346922f7d7c6d15bd666d317bf856dc8d6ab3b8a5fae3ee08916
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAF 5992 bytes
font_01_sfnt_off00006328.bin
8666c57ccff6e94cbb1bd0aa87aa72a4f59d4d1e01f27bcd421aec628e5cf0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6328 9020 bytes