Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c58896105c51e0c…

MALICIOUS

PDF

50.0 KB Created: 2020-07-14 12:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27c1a77fa5ebaa4a96fd3610c104303 SHA-1: 6ffe7ea97f762ea622f6ef8de91bd0c65a2a9942 SHA-256: 8c58896105c51e0cb038b4c8487f2510ac30bd904e621344b1ee66b9a098c3d0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through multiple compromised or controlled sites. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download.

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/wb?keyword=hydraulique%20industrielle%20appliqu%C3%A9e%20pdf
    • http://files.sarexplorer.com/uploads/1/3/2/8/132815742/2714008.pdf
    • http://files.jennifereifrigauthor.com/uploads/1/3/1/3/131378816/vugagulapi.pdf
    • http://files.hocrane.com/uploads/1/3/2/7/132740564/kuwojikixanis_vezesuki_xitulibis_laxijolotalin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/73842840927.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/domepuvub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://simetor.files.wordpress.com/2020/07/kejubofimojulum.pdf
    • https://numesurera.files.wordpress.com/2020/07/pebinimapusulonupituruw.pdf
    • https://kajoginali.files.wordpress.com/2020/06/rerolebinosu.pdf
    • https://jusuxifigig.files.wordpress.com/2020/06/35643090309.pdf
    • https://zelowavonomi.files.wordpress.com/2020/06/wokigajojuginiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72905654063.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/wimixoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonamanasalusowalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/bikusugutimobok.pdf
    • https://cdn.shopify.com/s/files/1/0430/0190/5315/files/28250288297.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/ripadudiruxaxogapom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/18650430856.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/liguret.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_off000077dc.bin
0ee256afce3ff8eb5c4f2ed07cb20a7e90050c9cca8db5a0c87298f68fb4fb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DC 5140 bytes
font_01_sfnt_off00008915.bin
7bc5ec8ca3f6666d0c15e12ecaaa4703bdc2bf6abee5cce476422835ea201e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8915 16060 bytes

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