Malicious PDF — malware analysis report

Static analysis result for SHA-256 711a604e404a879d…

MALICIOUS

PDF

62.9 KB Created: 2020-08-08 12:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 055c24551ed1eca25d1099c0a358f156 SHA-1: 2c62ee2f41819a9297ec2c0f08b437516b307eab SHA-256: 711a604e404a879d0a34faf575d649a735c2ec9a8ef6ffc4fe28fe5d8dac30e9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, while heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=les+articles+d%25C3%25A9finis+et+ind%25C3%25A9finis+partitifs+exercices+pdf
    • http://files.wcchakrahealing.com/uploads/1/3/1/3/131381374/8786177.pdf
    • http://files.oaklandriversidegolfcourse.com/uploads/1/3/2/6/132680901/lonisejaviwaleloba.pdf
    • http://files.lehibands.com/uploads/1/3/0/7/130776123/sawafoxeseva_benivenage_kimatipefug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/wavevifot.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/ripemusupox.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2313/files/jigef.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/9039409423.pdf
    • https://cdn.shopify.com/s/files/1/0437/1441/2694/files/94208781919.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/lesoxumedage.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/kamias_jam.pdf
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/cablage_automate_programmable_industriel.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/23753158654.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/puntos_craneometricos_unam.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/46982696863.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/wiravikunufudusop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a15b.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA15B 2828 bytes
font_01_sfnt_off0000ab55.bin
ace2eab83a46395da8214c4a940325fcf2c38959a31d6de72b6e76272b1e70aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB55 5300 bytes
font_02_sfnt_off0000bd2f.bin
b718a843502e63e3acb71ec15a877f29b2dca45165c007125cff429d1b9af24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 15712 bytes

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