Malicious PDF — malware analysis report

Static analysis result for SHA-256 72062065b72fe1cf…

MALICIOUS

PDF

67.1 KB Created: 2020-07-09 05:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ecf925ac384a0e69183e848a464360 SHA-1: 8777fd8c094b8df119b7241e04cd694a6f2f9f6d SHA-256: 72062065b72fe1cfdc2fdee030e952da07956a06007b2cd8ace29580caec5318
184 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, many of which point to disposable hosting domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm designed to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=thinkstation%20p320%20tower%20pdf
    • http://files.mc-kidd.com/uploads/1/3/1/8/131856382/2584925.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.energygroupuniversity.com/uploads/1/3/1/6/131606670/4d31e1.pdf
    • http://files.greenpestsolutionsgps.com/uploads/1/3/0/9/130969298/xigewazaju.pdf
    • http://files.morgantaylorphotography.com/uploads/1/3/2/8/132815063/b206bbcf8c32.pdf
    • http://files.keshaunadorsey.com/uploads/1/3/2/6/132681602/193cd5e2e8f.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jafujanile.files.wordpress.com/2020/07/10490046633.pdf
    • https://wuguzifopi.files.wordpress.com/2020/06/vumib.pdf
    • https://mameloga.files.wordpress.com/2020/06/94122313386.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00009ca8.bin
527f0044d9ffae07a00f3ca6443d50f214669858f39d3635d9127e2161f560a1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9CA8 17736 bytes
font_00_sfnt_off00008a46.bin
c7e936a77963c8ddaee66f7b190c70de572e8e493829323d0716c43bda4e6324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A46 5428 bytes
font_02_sfnt_off0000cc22.bin
4e26ab3a9dc1e3fa93915d0015c1b6317daf0a34606ea22a2be249c5a411e199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 15896 bytes

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