Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac761f9ddc323382…

MALICIOUS

PDF

42.5 KB Created: 2020-09-17 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f89f41938d26162bb3db465c76059e SHA-1: dc31c818b3bdd99a9b39b07be08930143c3e5062 SHA-256: ac761f9ddc32338233d1c6119dab1d205028f2414b0e3b5aa713cde989db2267
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and numerous URLs, including a primary redirector URL and a large number of links to external PDFs, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

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=brother+ls+1520+sewing+machine+price
    • http://files.robdisario.com/uploads/1/3/0/7/130775892/5535739.pdf
    • http://files.dolphinhousea1.com/uploads/1/3/0/7/130740255/lerezedox.pdf
    • http://files.weldcountymeatgoats.com/uploads/1/3/1/3/131383541/76c7f9.pdf
    • http://kitetabug.worem.org/uploads/1/3/0/8/130814328/6803215.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2149/files/30135626025.pdf
    • https://cdn.shopify.com/s/files/1/0433/5825/7306/files/69988964000.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/71268045287.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/rexusoweti.pdf
    • https://4d70a3e8-bd67-4856-b808-18c4973de419.filesusr.com/ugd/008a9f_89c525d340fd4386a0b14baae121b9bf.pdf?index=true
    • https://38ec70f3-25e9-4379-9d1a-156987ab790f.filesusr.com/ugd/668a47_23644e52a5704a82ae24935f3ba23579.pdf?index=true
    • https://76546957-ced0-4970-abc9-c4a7d2e186a2.filesusr.com/ugd/b926a8_2d5f19313d9c456d8eff3a26eb21ce3a.pdf?index=true
    • https://19aaaf25-3687-45e2-bbb8-fa7e7c3c02a2.filesusr.com/ugd/113e89_89b9f8ce6f8a4d669f649569304b1123.pdf?index=true
    • https://912e1ddb-7996-42fb-aa6e-ebb7aa3a9089.filesusr.com/ugd/a4c1fa_7e5e9202af814f34855b78ce5d50641a.pdf?index=true
    • https://8713b01f-6a18-41e6-8a60-3fa5a246c076.filesusr.com/ugd/43d598_c95713777a624b5da6171feef41b755c.pdf?index=true
    • https://6912f7e4-dff2-4f01-a2ff-447310091c46.filesusr.com/ugd/8ac1ab_dda9753c5f244290a775c87819a7e85b.pdf?index=true
    • 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_off00005e47.bin
707921f28b5a8c3206774579e2c5b6ebdb66886034791b92d8adc116647fa8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 5940 bytes
font_01_sfnt_off00007273.bin
06fac615371b4979929fe9e3f7017dd7a9aaf1320aef380fccea9e8d7522d174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 13328 bytes

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