Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec0042f1e09d883…

MALICIOUS

PDF

69.9 KB Created: 2020-08-11 18:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6ee00608d3ce538ae4ec0229cc0fe8c SHA-1: 629f61276074a4878e4c74442e4a4b222572741c SHA-256: 5ec0042f1e09d883d5ad6db99423d3a679efe6115b70f43e7e3f8a5ae50ffd57
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains the text 'ssc math formula pdf download' and the malicious URL, suggesting a lure for users to download potentially harmful content. The presence of a download button heuristic further supports this phishing attempt.

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.com/pify?keyword=ssc+math+formula+pdf+download In PDF document text
    • http://files.ussakiorder.com/uploads/1/3/0/7/130739267/worozole.pdfIn PDF document text
    • http://files.dlsu-aki.com/uploads/1/3/1/4/131437074/a73b2cc47d8.pdfIn PDF document text
    • http://xapoz.miltonhighschoolchorus.com/uploads/1/3/2/6/132681670/4629512.pdfIn PDF document text
    • http://files.soniabarneydesign.com/uploads/1/3/2/7/132740463/zamukigawutusud-sozofiluv-bavakofodetu.pdfIn PDF document text
    • http://pivile.beyondglamstore.com/uploads/1/3/1/8/131871871/3873215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7329/7814/files/19173499850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/xokovodogag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4406/8773/files/sevafiwimapilofov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/pupirugafirug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9460/5975/files/30305380142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/definition_of_cloud_computing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/rename_a_branch_git.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/50344092694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/mawozuzuduzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/17263573168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/talaximanuzadojomufazu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFB 5308 bytes
SHA-256: 74fc2a1594c478815c691251a5c5c5268fd211ccc647908dc949eb026866054f
font_01_sfnt_off000091d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D4 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00009d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D37 14680 bytes
SHA-256: 116283d2b57d9d2cf0e3e6f2458e11cee6f5a17ea44e951e516e5b46b1e1f912
font_03_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd
font_04_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_05_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 8032 bytes
SHA-256: 4b6a2fc28d584601e8e9fd01681dce6c07d90d23ea23f315c9c293576bb0672d