Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f2cb8100c86c72…

MALICIOUS

PDF

53.1 KB Created: 2020-08-19 19:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58fe41025335fff37a4359198d03ae51 SHA-1: 66f0dff80e72d420cc95805fdb1794aad2d7f1cb SHA-256: 08f2cb8100c86c7248e4684523eabe450a51234d47a657ecdd7f0ac857f5b31e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a party invitation template. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirectors. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a further stage of attack.

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=party+invitation+template+free+printable
    • http://files.superbloomcoffee.com/uploads/1/3/1/8/131871704/13bc9f9b3d5a6.pdf
    • http://mokorisu.colinjlmccartney.com/uploads/1/3/2/7/132710712/foravivenubanu-tijovokas.pdf
    • http://taxevinu.nicoangiuli.com/uploads/1/3/2/7/132740541/bigemekitifozofozeza.pdf
    • http://rifufav.haeppi-ranch.com/uploads/1/3/0/8/130874493/6509788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/94993372657.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/45967390426.pdf
    • https://cdn.shopify.com/s/files/1/0445/4033/0148/files/materi_assessment_center.pdf
    • https://cdn.shopify.com/s/files/1/0434/9349/0838/files/23589188090.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2771/files/employment_termination_letter_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/51353086228.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/tunanapojomidusoteso.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/limiting_adjectives_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/jetesos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1091/files/rozita.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_off000084d3.bin
368275c038e3cd30c6ff161afb8024d9ffbf6f6d0e1f81142b25bc69e9d64384
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D3 5172 bytes
font_01_sfnt_off00009660.bin
c236e0a4cba1649ff1e6d72c2f4a9e6fe718edf1d00dbef8826fb6263f09330c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9660 15912 bytes