Malicious PDF — malware analysis report

Static analysis result for SHA-256 0303cb138cfda732…

MALICIOUS

PDF

46.1 KB Created: 2020-08-20 03:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189b2d2a76d7db097a0b44fe4acbdc05 SHA-1: 9ed28c78a899c2137056ed841cf6cf386dddeee2 SHA-256: 0303cb138cfda732f03e74d175db824e1eb300cce3de9557193d77fb565d54d6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector URL (https://ttraff.ru/pify?keyword=no+10+envelope+template+indesign). Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, one of which is identified as a potential malware distribution point. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.ru/pify?keyword=no+10+envelope+template+indesign
    • http://files.wamuranstanleyrivercricket.com/uploads/1/3/2/7/132740361/papugud_zikadu_puzinosuponulut_bupomegudovu.pdf
    • http://soxifo.stlukecdc.org/uploads/1/3/2/6/132682974/zonuwewonik.pdf
    • http://kekuxuwej.delcodiamondsfastpitch.com/uploads/1/3/1/3/131379290/fefejo_kubawaburipo_wabobulizawon_julizobin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/xepimanamubuvaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/2020_calendar_with_week_numbers_printable.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/52177309329.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/zememure.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/60843911319.pdf
    • https://cdn.shopify.com/s/files/1/0436/6699/7398/files/27721721385.pdf
    • https://cdn.shopify.com/s/files/1/0447/0997/0076/files/politikal_na_pakikilahok.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/bijofonuzuloturese.pdf
    • https://cdn.shopify.com/s/files/1/0433/5963/3559/files/jusefulujef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7213/5074/files/40404972930.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/15542083112.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a3d.bin
9598cd80e2d1237729e095383c6715300efd72f8a40f63fc80345d187246c04b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 5196 bytes
font_01_sfnt_off00007bcf.bin
1ee9a5204492598b8770a26ce451826273f4065fffde05541dfb7f960499e134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCF 9688 bytes
font_02_sfnt_off00009ce1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE1 4324 bytes

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