Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ea9fb8ad20c624…

MALICIOUS

PDF

74.9 KB Created: 2020-08-06 14:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9736259ef5a7b7d2589edbef7d4cea92 SHA-1: d765539ab613ce5163244127fa29ef838dbc6637 SHA-256: 09ea9fb8ad20c6240f32b6d00636b4dd881d6b13f8af2da620e531ff6da28489
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body and embedded links are disguised as academic content ('algebra definition and examples pdf') to trick users into clicking them. The ML classifier strongly indicates malicious intent, and the presence of a malicious redirector URL is a high-confidence indicator.

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=algebra+definition+and+examples+pdf
    • http://files.joeyessmaracing.com/uploads/1/3/2/7/132741029/10833.pdf
    • http://files.sharkassault.com/uploads/1/3/0/9/130968950/zubizoziza_vivovap_mafudis.pdf
    • http://files.oliveleafhomes.com/uploads/1/3/2/6/132682232/jarazusaza.pdf
    • http://files.justinmikos.com/uploads/1/3/1/4/131437977/jadepizarilolikogeru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/49018808270.pdf
    • https://cdn.shopify.com/s/files/1/0437/2584/8727/files/76204948790.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1494/files/zigibuziseme.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/37856572565.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/biology_notes_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0439/2642/1672/files/74898937939.pdf
    • https://cdn.shopify.com/s/files/1/0438/0613/0337/files/suxosojuvigopimekaji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/lopubomejifaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/de_2501.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/duxekebafakotenurajasotub.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/kowemub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/39262630553.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/47445292419.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca6a.bin
94c6dda38bc8839dad6afcd5715155879327a4f37a87cc0039e4523ca7d06904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 5556 bytes
font_01_sfnt_off0000dd3f.bin
23480bb80b92a23810980046abb60fb128468fef67ad1e92134433a76b5e35d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 11752 bytes
font_02_sfnt_off000104ca.bin
ff1a5f617e4eefda294404dcef082d3058dffc13de9ac47b812cb027b9dfc5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 17224 bytes

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