Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e81838f913b96a…

MALICIOUS

PDF

57.8 KB Created: 2020-08-22 12:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7801697fb83edcd815d890d0d8f9f4de SHA-1: 0cc63a66823c8d9fb12e14d3a27762c6af7fbc2d SHA-256: 86e81838f913b96a2829599ea56ae9c605071af15b52e0bcf9a59269e2899095
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading Java, which redirects to the malicious `ttraff.cc` domain. This suggests the document is designed to trick users into visiting malicious sites, likely to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=java+7+32+bit+jdk
    • http://files.gcspatriots.org/uploads/1/3/1/1/131163943/xixefizesivawanidu.pdf
    • http://sojera.arkansaspottery.com/uploads/1/3/0/7/130775626/0c3182.pdf
    • http://files.easternvstromrally.com/uploads/1/3/1/8/131856112/3694269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/artigo_sobre_autismo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/acidimetry_and_alkalimetry_titration.pdf
    • https://cdn.shopify.com/s/files/1/0436/2256/4000/files/figures_of_speech_worksheet_for_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/5680/7586/files/geputo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/adobe_photoshop_cs6_direct_link.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bipifapokuwegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/8657757882.pdf
    • https://cdn.shopify.com/s/files/1/0461/4488/0803/files/ui-_grid_row_template_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/76301223879.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/ginarodoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/lomuzeduzowikekubebenen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099cf.bin
d5563fb5d98264f863792ddc82534466a9ef9b4155cea478a6fc7e5a7740f3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CF 4672 bytes
font_01_sfnt_off0000a9b7.bin
d7a6906449db68e85c933253323d0c19cf0b382f01ae816a06568a7974081902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B7 10084 bytes
font_02_sfnt_off0000cc51.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 4324 bytes

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