Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb6a1d51ba6d30…

MALICIOUS

PDF

41.7 KB Created: 2020-08-04 11:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27778060686e69246c9c6b3e1d9576ac SHA-1: 5f944da408751dbaca9c1b8a1459b3486bae209e SHA-256: 77bb6a1d51ba6d30a8f75bfb2306a83d06a7c159b8dbab923f72be395971a514
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'business letter pdf' and a URL that appears to be part of a link farm. The ML classifier also flagged this PDF as malicious. The presence of embedded links and the malicious redirector suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=meaning+of+business+letter+pdf
    • http://files.renoahome.ca/uploads/1/3/2/6/132683334/lakifubevezaxu.pdf
    • http://files.dublinbirding.com/uploads/1/3/0/9/130969440/dapegemon.pdf
    • http://files.prakrutischool.in/uploads/1/3/1/3/131380845/luboxelenabus-likoxiworo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/belifuvosibajim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/d_d_descent_into_avernus_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/60210761811.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/duruvedetewerunekigoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/1348/9318/files/bible_quiz_questions_and_answers_in_malayalam_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0447/4486/7994/files/password._txt_1_4_kb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27984898694.pdf
    • https://cdn.shopify.com/s/files/1/0434/0898/2165/files/18614150462.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/76162711935.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/cricket_score_sheet_for_10_overs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/97509919831.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/jupevaxole.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_off000064f2.bin
9223c9979c5e66fbf3fdce27a8798f08243e5682d42832a8312473818eb359e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 5352 bytes
font_01_sfnt_off0000773f.bin
ebfa8c3a1b3f6c77d7a3fea23175d3d9082fb2f19159abe6c0ab11dda4bfd1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 10172 bytes

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