Malicious PDF — malware analysis report

Static analysis result for SHA-256 9245c639179f7b56…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 10:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4b5616f9e5da467c1ce8e57d361e2a SHA-1: a98af6ba9ba552c35d79151fca19cd099a7d2233 SHA-256: 9245c639179f7b56b0dfd58feceffa5f9b6813dd3e492440d19d44f77c1516b0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to trick users into clicking through to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=gta+5+bennys
    • https://static.usrfiles.com/ugd/b8c837_75af4c98b558483ab5b7d42cc283ab75.pdf
    • https://static.usrfiles.com/ugd/b910ae_7566c82bda2642fc82b12398d2e4a886.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_e776c67786274ea4b608c1ebad4db4b9.pdf
    • https://static.usrfiles.com/ugd/daca0d_4a0a2c843e42486093a4b8bb61f70586.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/eclipse_linux_64_bits.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0503/files/penaxir.pdf
    • https://cdn.shopify.com/s/files/1/0439/1475/6251/files/albertine_kayp_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/lorog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/9204833299.pdf
    • https://cdn.shopify.com/s/files/1/0462/4488/8730/files/nedivapiregamame.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/xapefatilizopekejug.pdf
    • https://cdn.shopify.com/s/files/1/0462/4675/6506/files/25840480122.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/car_wallpapers_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/livro_fitoterapia_funcional_lucyanna.pdf
    • https://static.usrfiles.com/ugd/69695d_766848e065ce4acb811341a106c765cb.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b72828ebfc1a43478543b169d3317afd.pdf
    • https://static.usrfiles.com/ugd/5438e3_e6acdc44ce9c4bb1b5dcb97458688501.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_off0000650a.bin
0d929a3588fd8a238ac982cb01c965e5fc3459fe0641ee208f4731b5bba578ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 4576 bytes
font_01_sfnt_off000074b6.bin
659120de7fc94deb201b4d4517569160a4ea849d37a84fbdb0af55e92fbfc66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 10324 bytes
font_02_sfnt_off000097de.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DE 4324 bytes

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