Malicious PDF — malware analysis report

Static analysis result for SHA-256 08287ad755bfd7e4…

MALICIOUS

PDF

45.3 KB Created: 2020-08-12 11:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cf8f05a921755f0d9ec4c88a5e608e SHA-1: ddae224a80cf32d4e6613b6c43c1b05a4bdbbb63 SHA-256: 08287ad755bfd7e4f576bf8ae71e96f5d6d48ea1a3d19f5f5956716bd30651c3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute malicious content. The primary link identified, 'https://ttraff.cc/pify?keyword=igcse+biology+past+papers+pdf+download', is a known malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to disguise malicious links as educational resources.

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=igcse+biology+past+papers+pdf+download
    • http://ditej.fromtheheartliving.com/uploads/1/3/1/3/131383936/f904675b965e.pdf
    • http://files.polished-professionals.com/uploads/1/3/1/6/131607522/busefonag.pdf
    • http://files.forttryonviolinstudio.com/uploads/1/3/0/8/130813650/milozepisugo_mozisesufenit.pdf
    • http://rofirenu.sanowarfitness.com/uploads/1/3/1/8/131857445/zufiwexenujavusanax.pdf
    • http://panij.funnyjackmusic.com/uploads/1/3/0/7/130775432/1770561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/73475402797.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/square_root_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/92865862644.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1519/files/23634444930.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/89698172130.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/8436385163.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/49616496449.pdf
    • https://cdn.shopify.com/s/files/1/0431/0650/0769/files/personality_adjectives_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0451/2422/3141/files/business_email_etiquette.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/debunirodififovup.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/jovomubetadeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.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_off00005fcc.bin
8bb4d5cf2199829db9cec94c82ca5c91a329388db860051d9b4ae320707edcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 5596 bytes
font_01_sfnt_off000072e4.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 1800 bytes
font_02_sfnt_off00007b71.bin
b23c8173368a211505efdba65f095d3a2a7b0431a505deec202336d1c211825e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B71 14204 bytes

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