Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55242f3cea37e08…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48ce893a89eeca67c61cc92e26f60d5 SHA-1: 12567abb41c9ebd0a19434e51d905d0c7534838f SHA-256: a55242f3cea37e08885697dd6960dce07fe571f787919be17c733613bc995a9b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the string 'Spotify free music android' and the malicious URL, suggesting a lure for users seeking free music. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, likely for SEO manipulation or to distribute the malicious payload across multiple domains. The ML_NYX_PDF_MALICIOUS 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.cc/pify?keyword=spotify++free+music+android
    • http://files.martiniboxers.com/uploads/1/3/2/8/132815343/dofes.pdf
    • http://tetonira.gloryandgracesilks.com/uploads/1/3/0/8/130874284/kafamowaxiwowofegale.pdf
    • http://files.whitecubepicturelab.com/uploads/1/3/1/4/131406344/93bb9e2.pdf
    • http://files.glapousis.com/uploads/1/3/2/6/132695200/gamokapaverumapis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/wadevati.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/79236861269.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/kobinafatudapel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9767/files/63757568866.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/angry_mood_whatsapp_status_video_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/pezezilomujidixiras.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8434/files/metafisica_de_aristoteles_garcia_yebra.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/jolizekizowosusowobal.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/39897336500.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/41379327224.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/ordo_hemiptera.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/jajafoz.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_off00006852.bin
90e587efadb1c28ec5da2847bca582d32c0bc07d9ef291e2412ed797608a4399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6852 5472 bytes
font_01_sfnt_off00007adb.bin
35d14e2b2ded3a89004427fd8f134fe25f4164289e4f4296ce6b4f5c1028633a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADB 14932 bytes

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