Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eae485fab424d3…

MALICIOUS

PDF

95.9 KB Created: 2020-10-25 03:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60e73630afb6a6652f5853a43ccba03f SHA-1: 7c3b626f65bba8c7f4cc652d6d950ee04517f02d SHA-256: 16eae485fab424d383ab2ba68b50d67c4b25f1c43df2855acd33eca8eebb20af
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to 'simple and compound sentences worksheet' which directs the user to a malicious redirector URL. This is indicative of an advance-fee scam or phishing attempt, likely delivered as a spearphishing attachment. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.link/123?keyword=simple+and+compound+sentences+worksheet+lesson+24
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5f949d95737cd.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8c77c8afca8.pdf
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f949f444c134.pdf
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8b7dd8adc84.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f88a849c1a11.pdf
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f8a03ff8747f.pdf
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f8dfd4b1a638.pdf
    • https://xukaxikerebata.weebly.com/uploads/1/3/4/0/134042698/4711416.pdf
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/70f77a9bf0ac1db.pdf
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/vefewesipelal-rosurajo-kedefer-samibasejaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/62790403675.pdf
    • https://s3.amazonaws.com/pazifetanegapu/change_arabic_numbers_to_english_in.pdf
    • https://s3.amazonaws.com/xamibudasagas/horaire_train_amiens_paris.pdf
    • https://uploads.strikinglycdn.com/files/b6888056-3fb5-42b8-abe2-0187416d063e/31768664208.pdf
    • https://uploads.strikinglycdn.com/files/f5606eb6-1e35-4a6e-be19-ab33d6ac2372/bezodode.pdf
    • https://uploads.strikinglycdn.com/files/0b7f4092-8e23-4c7a-9e05-78b9963b02ab/jagajunepupax.pdf
    • https://s3.amazonaws.com/regufojalojaza/basic_algebra_questions_and_answers.pdf
    • https://s3.amazonaws.com/ritoma/95187611454.pdf
    • https://s3.amazonaws.com/zuxadol/cauchy_euler_equation.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/22611865564.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001234b.bin
466f381a0f681a7c7e212b530b06009459eaa064e8d03380be2b2087f4bd334a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 5792 bytes
font_01_sfnt_off000136ef.bin
960eca59f3f53081acf1d12efa3fed372b0e06648c454fbe0968a261574e49b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136EF 10572 bytes
font_02_sfnt_off00015b06.bin
313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 16060 bytes

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