Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7d6b455b31f957…

MALICIOUS

PDF

41.7 KB Created: 2020-08-13 23:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f01b72f73b6a3922fe435e0bfa720c6 SHA-1: c67546ba3edee86eadf9f2d5532cb929b721306d SHA-256: cd7d6b455b31f95738d47c882e49057e9a446d86ac33f2429b64ebec28c0aad6
152 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm, with one prominent link redirecting to a malicious URL. The document body mentions 'Spotify apk android 4.4.2', suggesting a lure to trick users into clicking the malicious link. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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=spotify+apk+android+4.+4.+2
    • http://files.vintuitivewmt.com/uploads/1/3/1/4/131437247/9288012.pdf
    • http://pozafe.mrsramosvirleysartclass.com/uploads/1/3/1/4/131407241/topozadepokow_leranek_vajigupenozur.pdf
    • http://files.distinctwealthmanagement.com/uploads/1/3/2/7/132740352/porowezifemovafatan.pdf
    • http://files.bathbybecca.com/uploads/1/3/1/8/131856392/dupova.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/kizasafalapetuxemuwemij.pdf
    • https://cdn.shopify.com/s/files/1/0437/8722/3198/files/faronopemeximabikimemijo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4711/5157/files/14468708917.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/upsc_cds_2_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/microsoft_windows_search_protocol_host.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/84979941556.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32686583269.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/mesefididinex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/gupuzotixiximewupenodal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/technical_analysis_full_course.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/32088499879.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/temikopotibifajomo.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_off00005935.bin
c790e88b552831bae23e9f6691cb27495ab1596bf9d608622fb8a9813f52961d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5935 5016 bytes
font_01_sfnt_off00006a54.bin
4ab8178387ce9ae53499fad6cd7a1330637ae8dcbf040f34dc0faed28c174977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 9784 bytes
font_02_sfnt_off00008bbc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBC 4324 bytes

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