Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcc19a38f60c498…

MALICIOUS

PDF

56.4 KB Created: 2020-07-27 00:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de893a880e91c633db1f625ef3d98b7a SHA-1: 2406f7205d32ffd8cfdcdfbacaac2fccebe41b0c SHA-256: bfcc19a38f60c498ac75ba57fd23a2506992934c92bbf12e532e16827e6d3078
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many of which point to a redirector URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic suggests a large number of external links are present, likely for SEO manipulation or to distribute malicious content. The document body appears to be malformed or heavily obfuscated, preventing a clear understanding of its content beyond metadata.

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=accounting+basic+rules+pdf
    • http://files.folkloreandfern.com/uploads/1/3/1/0/131070202/botemokisekep-gesumajumigiw-meteziwe-dewija.pdf
    • http://files.bizfxmedia.com/uploads/1/3/1/4/131408741/4387937.pdf
    • http://files.harmonautoinsurance.com/uploads/1/3/1/4/131437229/wuzofurijemepimuse.pdf
    • http://files.throttle-steer.com/uploads/1/3/0/8/130873923/pajevelim-vikigojaru.pdf
    • http://files.sierranevadastorytelling.org/uploads/1/3/1/4/131483108/45fe2f7a.pdf
    • http://files.harmonautoinsurance.com/uploads/1/3/1/4/131437229/wuz
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/bowotevuvojub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/bolebusaxezifex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamefidijuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/xamegubomelefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/movamemutal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/tabusuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/74566888853.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/wesapabitozej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/73543435154.pdf
    • https://cdn.shopify.com/s/files/1/0434/5030/2616/files/14240105563.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/nenagulog.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_off00009fd9.bin
14aa9626dc1d8dfb500f95564a55fd1a235b7830409356fc52463074b586d539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD9 5332 bytes
font_01_sfnt_off0000b1fa.bin
67b49fc5af1ff441fce8ddf9ee68f568d57a0b1da6373adb26ce1cbf7a852121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10080 bytes

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