Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a08ffd6370b2f…

MALICIOUS

PDF

49.8 KB Created: 2020-08-04 13:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f7d1e6482cbf1c43ec8beb717641e3 SHA-1: e0f8ba2a282bcba5499babcd701640f0da8cace4 SHA-256: a46a08ffd6370b2fdd8f5adab3fe08e3f36775b6cd09f6afeef7bb61cc0c0326
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector (ttraff.ru), suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the target URL and references to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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=arquitectura+viva+revista+pdf
    • http://files.crownukmission.org/uploads/1/3/2/7/132740549/mizaxujon_zarokefi_vefusel.pdf
    • http://files.monarchaccountinggroup.com/uploads/1/3/1/4/131438069/vesolomopu-xiluvizepikojo-dilowiparufema.pdf
    • http://files.coachacha.com/uploads/1/3/1/4/131452876/34faeed7e4886fc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/megobagoxirovuzodav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/genuwunogadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/42143632261.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/37719919468.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/93140933517.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/starboy_the_weeknd_album_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/49715117894.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/70700899829.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/vujozabuxonexosune.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/93078465575.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/6198534542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076a8.bin
2b3ebf45d2a8691c09d4eb713f35d558a5f74f65f451d22ef274eaaaf616e899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A8 4960 bytes
font_01_sfnt_off0000879c.bin
a808207442fe325a8242f898b285aba32d689314b894a3ec45791b216846dc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879C 10668 bytes
font_02_sfnt_off0000ac1a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1A 4324 bytes

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