Malicious PDF — malware analysis report

Static analysis result for SHA-256 646fa82514a18bad…

MALICIOUS

PDF

36.3 KB Created: 2020-08-09 20:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad830e47d0f0c21125617e9b5a910b8b SHA-1: b0f6125268ab7cc58795e92760027eef038b7e1a SHA-256: 646fa82514a18bade765e7c2fae24cabc94e5f8c92406d4b41a78fbf911fd51c
170 Risk Score

Malware Insights

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

The PDF contains a deceptive title 'Ubah file pdf ke excel' and numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the link at https://ttraff.com/pify?keyword=ubah+file+pdf+ke+excel points to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic further suggests a large number of links, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/pify?keyword=ubah+file+pdf+ke+excel
    • http://ramutezib.shellyginterconrad.com/uploads/1/3/1/4/131407089/6640543.pdf
    • http://tomiredin.alexbrightphotography.com/uploads/1/3/0/7/130775432/zalafigez.pdf
    • http://files.reducerecidivism.org/uploads/1/3/1/6/131637168/7974748.pdf
    • http://files.618bass.com/uploads/1/3/1/4/131453007/didirinid-vibemeg.pdf
    • http://files.kiefferphotography.com/uploads/1/3/2/7/132740852/196e24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/diablo_2_power_leveling.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7297/files/radoraxafokugasaxekoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/categories_for_working_mathematician.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65294746239.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/infarctus_du_myocarde_symptomes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/66187802594.pdf
    • https://cdn.shopify.com/s/files/1/0428/3626/3078/files/69428833145.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/79581062411.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/gutip.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/88537455144.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_off00004e05.bin
a4f968718674c0539c3379729230146209d504cb8d8623097ca54c33beeb7b76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E05 5232 bytes
font_01_sfnt_off00005fd6.bin
d93fff4388b7d2bc3ed49adebebb2a6c02b21d1c2cde56d3c904d4289baa6011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 11860 bytes

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