Malicious PDF — malware analysis report

Static analysis result for SHA-256 79385aa95a5a0796…

MALICIOUS

PDF

35.0 KB Created: 2020-08-14 17:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c95cbb010b5941d2604f0ffa67f92c0 SHA-1: cc8f8521ec89ac6e12bd2c4d09d48df89bb295bb SHA-256: 79385aa95a5a079644aef4039f59b9cea51b9c0b32969a660610432676716580
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a financial report. The presence of multiple external PDF links, some benign and some unknown, indicates a link farm strategy to obscure the malicious redirector.

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=royal+dutch+shell+plc+annual+report+2009
    • http://tipavib.menofwinds.com/uploads/1/3/1/6/131637136/vepapetor_lemukege.pdf
    • http://files.alejandrodrago.com/uploads/1/3/2/7/132740285/warisavusixej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/zusitewazibuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/mepazen.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0391/files/cargoes_john_masefield.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/geological_mapping_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/zavexonuborinelobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2269/files/70005830147.pdf
    • https://cdn.shopify.com/s/files/1/0437/8542/0949/files/piwuwufewakurotuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/knee_arthroscopy_rehabilitation_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1344/files/boorstin_the_image.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/7850588545.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dbe.bin
847cf02703f2dce2afc08948df73a8e5648bd6f251fbe5e72619af5ce4bece41
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBE 5700 bytes
font_01_sfnt_off00006116.bin
bcb16ede956e372b217f1104e0e9b7dfb3c7c97f02d6a378f7313435d46947b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 8892 bytes