Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c778baad583d9e6…

MALICIOUS

PDF

46.0 KB Created: 2020-08-22 23:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35d7255b24796032bb9f55f2936d0a0 SHA-1: 100a1a1ef6190f0f66b6dd23a0bffb08a4198af4 SHA-256: 4c778baad583d9e6fef21e71ebff2df0d79612883f64d4b75fa63f036e8abb95
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'reading and writing worksheets for kindergarten pdf' and a URL that appears to be a lure. The primary malicious URL identified is https://ttraff.com/pify?keyword=reading+and+writing+worksheets+for+kindergarten+pdf, which is likely used to redirect the user to a malicious site. 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.com/pify?keyword=reading+and+writing+worksheets+for+kindergarten+pdf
    • http://raraziwab.deltatacticalknives.com/uploads/1/3/0/7/130775493/paxotavumofazuw.pdf
    • http://files.adultedresources.com/uploads/1/3/1/6/131606127/9b158.pdf
    • http://files.peonygiftsandkitchen.co.uk/uploads/1/3/1/4/131453402/1020994.pdf
    • http://files.revcarolreed.com/uploads/1/3/0/7/130776407/9f61dc.pdf
    • http://files.k9hardcase.com/uploads/1/3/1/4/131482821/bc25068a4d9.pdf
    • https://cdn.shopify.com/s/files/1/0436/0398/4547/files/res_aaResources._dll_104.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/bufferedwriter_android_error.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/93417972407.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mukevomisuso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/najakaminafazazawolalaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/gisilubonisevuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/9349/0838/files/1228368614.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/5522726233.pdf
    • https://cdn.shopify.com/s/files/1/0455/8025/5397/files/the_little_black_boy_blake.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/16155943423.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/72599715229.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/xidogerawiwejupajipigisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/abacus_maths_for_class_1.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/aow_planetfall_assembly_guide.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_off00007435.bin
a28c1880f3c16ad3bc38d7ad17eed0617c911f7eb63faad1e0e05c7b02f35077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 5436 bytes
font_01_sfnt_off000086c5.bin
c73d526863d73f27301fb82a7bdcf9265818d6375b91ac26d9acef7fc7425e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C5 10404 bytes

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