Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c6b00ae8e2081b…

MALICIOUS

PDF

70.1 KB Created: 2020-07-31 20:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf337a5d625ca4a4a4efdcc91314bd00 SHA-1: a1977e200901b0434ba6195771176c460eef2181 SHA-256: a6c6b00ae8e2081bd31461c313c4a4c059c787061524e4386556dc31e1fd280e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The document body, though partially corrupted, contains the string 'Concatenate string in c' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=concatenate+string+in+c
    • http://files.greenadaptations.net/uploads/1/3/1/3/131398222/kesonet.pdf
    • http://files.learnwithshiya.com/uploads/1/3/2/7/132712129/adf7596bc3608f.pdf
    • http://files.orchardparkhoa.net/uploads/1/3/0/8/130814644/2061652.pdf
    • http://files.elaineraydesigns.com/uploads/1/3/1/6/131637177/783e8b.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/totejekapubuvepub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/880896852.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/94641691010.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/ralaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/79347736297.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/vatufarugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/9819083387.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/makagomavapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/bobekibur.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6054/files/18737721602.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/83143849842.pdf
    • https://cdn.shopify.com/s/files/1/0438/3001/8210/files/lawaxijex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9101/8396/files/lobubaxunusom.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/sefukefisinet.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094ee.bin
dbe7061804e04e74f2e0cec5d7dc78e92304e44f16220b2ca76fb1f6078d8bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EE 4744 bytes
font_01_sfnt_off0000a50a.bin
ad0a41e005d64bb07f025ed8f2e1abb77351adb55d275788e2a3ac3c5cf13f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50A 2520 bytes
font_02_sfnt_off0000aff1.bin
507a60d8441c709f998e847e9d0b3077cc21ca55d3f8385eec285ab00fd5dd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 16772 bytes
font_03_sfnt_off0000e4b1.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16312 bytes
font_04_sfnt_off0000fa3d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 4324 bytes

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