Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3f922fef7afb9f…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 20:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edcd3af26b4c7f6038b02e743d9118c9 SHA-1: 9c5ce58011d8ea43e46c463c0cc0e9cbbb0107b9 SHA-256: fb3f922fef7afb9f379ca9e8e39ece2c08d9c1bfc23f7135b947f07a536b4cd8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'relational database design and implementation pdf download' and the malicious redirector URL, suggesting a lure to download a malicious file. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=relational%20database%20design%20and%20implementation%204th%20edition%20pdf%20download
    • http://files.lishammons.com/uploads/1/3/2/7/132740595/kawisite.pdf
    • http://files.desmidtbuilders.com/uploads/1/3/0/9/130968961/997bba433d1f3.pdf
    • http://files.jasehlee.com/uploads/1/3/2/8/132813998/fezuwewak-vafuritetix-neludokapulad.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/sagegoborus.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/27682859556.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9288/files/zuduluv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/massey_algebraic_topology.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/schwin_bike_computer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/chuyn_file_dng_nh_sang_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/gupasuvetajutabusajovugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/gutowemabaliwufus.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0085/files/33372172269.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/9453355859.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8300/files/badenenujirutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/gejotupoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/data_analysis_using_excel_2020.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e40.bin
ce5f83ce5b31891e61ab2ddd72818c7d2c3007585e310b2472b81dccf5b0088b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 5688 bytes
font_01_sfnt_off00007195.bin
4f71d45fe3ba5af5e6a6d37d3380632733974630b2e83d26bbc531cfb9e9fc00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 11088 bytes

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