Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e6b918e27e493f…

MALICIOUS

PDF

45.7 KB Created: 2020-08-22 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117967f4feba65f5624aaaaffd62c053 SHA-1: da1754b55da712a83f1314f93676e584043565a5 SHA-256: 56e6b918e27e493f716aa1727807264770a99828d442af0d12ee917ac058c383
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains the text 'Sound cue app for android' and the malicious URL, suggesting a lure to download a fake application. The ML classifier strongly flagged this PDF as malicious.

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=sound+cue+app+for+android
    • http://files.bamboo.gs/uploads/1/3/1/6/131606128/pewub_vegatiwevip_rulumag_besokade.pdf
    • http://gasotag.d-93constructionupdates.com/uploads/1/3/1/4/131438268/wutewogod.pdf
    • http://files.nicolebrauchart.com/uploads/1/3/2/7/132740580/39eb14.pdf
    • http://files.torontometabolicclinic.com/uploads/1/3/0/9/130969985/8c15297c04b1cfb.pdf
    • http://files.jebelalicatechists.com/uploads/1/3/1/4/131409055/fivabiwi-mekowevojupobi-resowelavomiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/98237016687.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/cell_structure_and_function_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/chronological_resume_format_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/dowokinonutitedegop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/97487852286.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/digital_marketing_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/kapukonidiwixu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6349/9159/files/numudizuzaxawepoban.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/danozetemik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/functional_cross_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8901/files/paxumoxezuxerilegikuvav.pdf
    • https://cdn.shopify.com/s/files/1/0436/4386/3198/files/99835428363.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_off00006899.bin
93225247a34cc590c86c4022900f4f6db138c76d346c77fe59e70072afd01ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6899 4844 bytes
font_01_sfnt_off0000790a.bin
0be8d9aac6745d17ff622e3d7ea25ca3b6d09ac00991eca0e53d1a87e11ae365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790A 10104 bytes
font_02_sfnt_off00009b9c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9C 4324 bytes

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