Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c21eb7e0ad9c291…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 14:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8dee1473189e9047064791f2f903ce SHA-1: b9044c1876660c4827a30f5f92fe38eeb340ccd3 SHA-256: 9c21eb7e0ad9c291a561a76e194ef4a277875eab3db745933d42a65d39d7e8bc
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=dark+mode+zalo+android', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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.cc/wix?keyword=dark+mode+zalo+android
    • https://static.usrfiles.com/ugd/b8c837_6d8407c9959e4ee9ae53b1189bb69f36.pdf
    • https://static.usrfiles.com/ugd/b65acf_d6f4ac254b1d48ab880b392fae708e16.pdf
    • https://static.usrfiles.com/ugd/b8c837_d422ec1068354474a274f0a8a3d3554d.pdf
    • https://cdn.shopify.com/s/files/1/0435/2462/0447/files/analisis_foda_personal.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/10637733111.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/dejuwam.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9054/files/oscillator_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/pevolafasanasezefapatem.pdf
    • https://cdn.shopify.com/s/files/1/0438/1320/8221/files/fugusitikevewuwisaduw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4861/files/sway_pussycat_doll.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/95052487527.pdf
    • https://cdn.shopify.com/s/files/1/0457/7689/6156/files/22831268620.pdf
    • https://static.usrfiles.com/ugd/b8c837_d45b111e88584da98dea72fcc6a5f0b3.pdf
    • https://static.usrfiles.com/ugd/8c0e65_955449d3a4bf4681b06351bd12e60db6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bc711463b5543f9bfda39dff8fea57d.pdf
    • https://static.usrfiles.com/ugd/1decf9_adc8c77e84bd4c13b88b10759eb81df4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c064f48203fc4112bd9e96fab972b9f6.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_off00004b9b.bin
c036cf55159f23aef9be499ab72c2b6f15aeaffd151dd77bbfd27a600681122b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9B 4904 bytes
font_01_sfnt_off00005c37.bin
db10b07aa1ba911afaf060b12e2cde8c70dbbf9941f30369d108722010ce9547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C37 1648 bytes
font_02_sfnt_off00006481.bin
3a54ab533f3c0b9edfd372f36358b89015a0ce6286601562fd016ff2be0323a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 11104 bytes
font_03_sfnt_off00008851.bin
bf5167c075d774c9e2ea62677ca3e8ada31171b92f4b1a4ec278e3e852de99fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8851 16320 bytes

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