Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126c3b2227ff55b…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 03:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3237324a803ca8887be845ae56174b7 SHA-1: e3f8b06d724d586ed021eec5f4c694a32aa3e51f SHA-256: 8126c3b2227ff55b76c2b64bc2238a1c30f78c3893f0745603d57826fdc4de5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, suggests a lure related to 'Mother's Day worksheets activities', which is likely a pretext to drive users to the malicious URL. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a high likelihood of malicious intent.

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=mother%2527+s+day+worksheets+activities
    • http://files.marymartinharper.com/uploads/1/3/2/7/132741535/mixatojakatofer_jajodisa_vawokibexusef.pdf
    • http://files.decktuneuprapidcity.com/uploads/1/3/0/8/130874090/zamar-subuwumo-vixuv-runob.pdf
    • http://files.pjeterkoleci.com/uploads/1/3/2/6/132681938/f414f68e3faf.pdf
    • http://xafoju.somalimuseum.org/uploads/1/3/2/7/132710621/nalega_wemegok_sodusituniwag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/akiyoshi_rikako.pdf
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/bigukeguri.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/66579304717.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/kamus_terjemahan_arab_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/wafuwupuxoxarivujeku.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/5580397310.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/organon_aristotle_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/jozozarubazunajegadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/tosuzapijaxezokisin.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8564/files/fumadekanuwer.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/didulujudikuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/repudobulumexemid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bd.bin
973e70be380dec2d24318e5a67ea6a519c24379a39a995c842f4d0025e9f72b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BD 5352 bytes
font_01_sfnt_off00006c16.bin
3a2d6cb0c62d32838dfcf298f7df142701dbe7fcb61658e5df9bde1a1e30fa7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 9936 bytes

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