Malicious PDF — malware analysis report

Static analysis result for SHA-256 395029c02ea2d3bb…

MALICIOUS

PDF

43.8 KB Created: 2020-08-22 17:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1219a5594a641f28c4989c26d269eb SHA-1: a33425629b7b7dc40acbc6fc27302323d9b395db SHA-256: 395029c02ea2d3bb2d3e567b4265c22ca1fede612d9e578a61a6e0aa32e3c80a
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a redirector known to host malicious content. The document body, though heavily obfuscated, contains text related to 'Excel 2016 spell check protected sheet', suggesting a lure to trick users into clicking the malicious link. The presence of a link farm further indicates a malicious intent to distribute malware or redirect users to phishing sites.

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=excel+2016+spell+check+protected+sheet
    • http://files.shainavglass.com/uploads/1/3/1/0/131070137/nirawud-jobiwef.pdf
    • http://zeronu.maryumiller.net/uploads/1/3/0/8/130813554/2494744.pdf
    • http://tapaw.polarissecurityconsultingllc.com/uploads/1/3/1/8/131856772/7683467.pdf
    • http://files.themuseprojectnyc.com/uploads/1/3/1/3/131379312/9646491.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/waxesazuvijakilodoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0448/4546/5762/files/xatur.pdf
    • https://cdn.shopify.com/s/files/1/0428/1591/4151/files/cantigas_de_amigo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0447/5292/8919/files/reading_comprehension_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/java_swing_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/libadokebejatamujapitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/fedun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/jipafonuletesolex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/tafifakudex.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_off00006ca6.bin
d563a1e5233254d8cc59f2f4ec7f014288e659ad418092153aca3881a59aac23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA6 5520 bytes
font_01_sfnt_off00007f6a.bin
f88a91228fecb7ee0f8ea16d5b30528518f399b25f61a00980a75d6fbd1898e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 10256 bytes