Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba6bd7783c84fba…

MALICIOUS

PDF

87.9 KB Created: 2020-08-30 03:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2978774bd3c6da448841bf65099f2cdf SHA-1: 17b4b77b19029bde0b9733ada87c9f6c3167f4a6 SHA-256: aba6bd7783c84fba4c575df3893ff936c164cf90f1a6c5a8d93eebd969bf3511
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised with text suggesting it is an 'EMT study guide book'. The ML classifier strongly indicates maliciousness. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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.cc/wix?keyword=emt+study+guide+book
    • https://cdn.shopify.com/s/files/1/0448/5578/7681/files/angling_times_catch_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/fefumodudifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/69092024199.pdf
    • https://static.usrfiles.com/ugd/238140_02f152bdce6948b09455009240cba3c2.pdf
    • https://static.usrfiles.com/ugd/b98abb_dc06d81da3674811b3cdc03da0b9e7c6.pdf
    • https://static.usrfiles.com/ugd/0df15e_a5db09b1b986475cb939a546edaa8d91.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/muzuzub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/81955287497.pdf
    • https://cdn.shopify.com/s/files/1/0438/3847/2357/files/video_dangdut_adella_terbaru_full_album.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/90627355438.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/
    • https://cdn.shopify.com/s/files/1/0448/5578/7681/files/angling_times_catch_repo

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f14.bin
23b2f88273a47f1d95daef30b555718ac84232cc3cdc5b2fe37a8daad8d65079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 4844 bytes
font_01_sfnt_off00011fa2.bin
d22e24bfd32ed7c91f12231caaf6acb3b2d58f77a1d56b8df5a730974e6fb6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 10908 bytes
font_02_sfnt_off000144af.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 4324 bytes

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