Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5118c20d2476c5b…

MALICIOUS

PDF

46.7 KB Created: 2020-08-24 00:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e20a9d55f2605aa0f983c6c767cb45 SHA-1: f597494b45bc2a9ba6529c828816c77a3fea0cba SHA-256: f5118c20d2476c5b07f004f00b6d16332be5f3b885c9c89c19adde9dae208703
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body, though heavily obfuscated, contains references to technical documents and URLs, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a link farm.

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=1n34a+diode+datasheet+pdf
    • http://files.beccacevans.com/uploads/1/3/2/6/132681545/mubuxafomejasonuki.pdf
    • http://files.millimiracle.com/uploads/1/3/1/4/131407315/lugifo.pdf
    • https://cdn.shopify.com/s/files/1/0457/6906/4614/files/chloromatic_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/6654456442.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/autocad_electrical_symbols_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/28371655954.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/vasazowotovesanavame.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/axial_fan_design_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0431/0325/6737/files/775816912.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/installing_sql_server_reporting_services_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/pirelegize.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/mixed_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/tiwamen.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000558d.bin
559f5d2af7ed5a9079b0f5ddfa2fb42f8dd07ef35d2a832f059cfdb5d8713328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558D 2044 bytes
font_01_sfnt_off00005ef7.bin
0e98be67eba76635c4b8fe859c6685a7f8be9ebe5c5fe1cf367e745f4f5b5c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 4068 bytes
font_02_sfnt_off00006d6f.bin
83ea31c4b3ceae61e3856761459f4437b810043de4ec0c0012a9de1199a1ee6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 5212 bytes
font_03_sfnt_off00007f30.bin
8a6882be5a8a96b2a8b317dffd0fb654a15ed484bf628aa98b2305379cfe4985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F30 15068 bytes

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