Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7bb1bf8cb50561…

MALICIOUS

PDF

43.6 KB Created: 2020-07-08 16:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39171254f2cd0cedf192469704f0ae55 SHA-1: 67fb107718bbf36a1a3ab423a8568d15c525bff7 SHA-256: 8e7bb1bf8cb505612154b3f830e86ee1e4520fab96b92fb1554cd9d8515f507a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a link farm, containing a large number of embedded URLs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=lua+scripting+language+pdf'. The document body, though partially obfuscated, also contains numerous links to various domains, suggesting a broad attempt at redirection. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=lua+scripting+language+pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://files.artographicexplorations.com/uploads/1/3/1/8/131871677/4499f.pdf
    • http://files.kimberleyashleecatering.com/uploads/1/3/0/7/130739690/wiwaxupoxadawex_bawulixi_jajisar_lerazim.pdf
    • http://files.cypressgulf.com/uploads/1/3/2/6/132695493/rupebulezonidugoz.pdf
    • http://files.tdtravelpartners.com/uploads/1/3/1/4/131408930/1166707d0a7.pdf
    • http://files.juliathepotter.com/uploads/1/3/1/8/131872178/dovimafewol.pdf
    • http://files.en.msp-lawoffice.com/uploads/1/3/1/4/131406433/mobumikefe_sajupebugodow_vikapup.pdf
    • http://files.accountinguci.com/uploads/1/3/0/8/130873907/wafizelov-josekijaze.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://files.maggieshine.com/uploads/1/3/1/3/131398000/kimexoka-milepedutavijir.pdf
    • https://xiwurigirisi.files.wordpress.com/2020/06/1177177662.pdf
    • https://bapalejuna868855280.files.wordpress.com/2020/06/54047402644.pdf
    • https://wesowomak.files.wordpress.com/2020/06/lomipexaw.pdf
    • https://litosem.files.wordpress.com/2020/06/jazegixudakifawiketidumux.pdf
    • https://miravusugox403843391.files.wordpress.com/2020/06/tepajigejatotegixibuw.pdf
    • https://zojaxatij.files.wordpress.com/2020/07/19954250866.pdf
    • https://tudenobinedu359522656.files.wordpress.com/2020/06/79336937572.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.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_off00006cd4.bin
a6c7db21646e6b013ad9b4ec6e986ca5d069fecbb81a34c1739df6092a30ac66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD4 5036 bytes
font_01_sfnt_off00007dfc.bin
d2f394769dc2656e1a816f1fe0c4953a7e92bfe2c92a037d4393ed4d0d16ba3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 10392 bytes

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