Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5803afd1273cc87…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 02:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2322e091396ea776aa17fdaec465ee61 SHA-1: 46b5bef8d3f7f890aab2b19b1df1ca0fbd6a18e2 SHA-256: b5803afd1273cc874dacd813edcc7cfdb7e6a6a109fb0f5df77ce9675ac63064
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing numerous external links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the suspicious URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO poisoning or a phishing lure leveraging 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.club/wix?keyword=how+brands+grow+byron+sharp
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/azure_data_factory_v2.pdf
    • https://cdn.shopify.com/s/files/1/0435/7036/4571/files/the_charioteer_of_delphi_comprehension_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/70835970335.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/6978517442.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/menuwe.pdf
    • https://static.usrfiles.com/ugd/b8c837_26c3541f9e194a36a67a005f443bab04.pdf
    • https://static.usrfiles.com/ugd/b8c837_e824070f6e1745b1bfb4cc3cb22c099a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a4c71da2b7344d285032b6f52991236.pdf
    • https://static.usrfiles.com/ugd/af0aa9_8f2e41b7ed6b4cd79935681b2b95541e.pdf
    • https://static.usrfiles.com/ugd/87a178_0eb7128e4e1c489e9e0c3400b464b614.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/bewibaxexazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8423/files/sri_rudram_namakam_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/pazifuwewifipat.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/list_of_numbers_1-_10000.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6556/files/zuvaguxujet.pdf
    • https://cdn.shopify.com/s/files/1/0460/6466/4731/files/gufoduledipepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/mitekexonok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/hack_wifi_password_without_root_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a3f.bin
4427a03600e4a619c955b1ec2db15288670338aa658eb95e9cc073ebd1a85042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3F 5024 bytes
font_01_sfnt_off00008b39.bin
7c8aa34b285f52aada78e4fa1954f9190e3e77b25a8c5ba077618ba68452c971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 10304 bytes
font_02_sfnt_off0000ae6e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 4324 bytes

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