Malicious PDF — malware analysis report

Static analysis result for SHA-256 83157106deb89820…

MALICIOUS

PDF

34.7 KB Created: 2020-08-15 20:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 509f1650a48e61086f7ef988a22d8294 SHA-1: b64990d78e50277a2d0066f55a5af55f2756cada SHA-256: 83157106deb8982059d91fc168375e7792658b52b5ceaa368a30b1531ea13555
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious content. The ML classifier strongly indicates maliciousness.

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/wb?keyword=tulsi%20vivah%20aarti%20pdf
    • http://files.caritascomics.com/uploads/1/3/1/3/131383480/4700687.pdf
    • http://befinos.nudgetraining.com/uploads/1/3/0/7/130775971/5f5e13b91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/abstract_reasoning_practice_tests_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/lefojumederevigitemadefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/43808538346.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/free_pbr_materials.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/98015040163.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/57125927936.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/rupodulova.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/37391628616.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/internet_advertising_is_anybody_watching.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/fundamentals_of_electrical_engineering_rizzoni.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ef4.bin
0d684b8aa4d5c3d5b48f702c98ed4fa5e1d97f3a915fb26319ecde02408d8d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x3EF4 5136 bytes
font_01_sfnt_off00005069.bin
9d8f5260be5344931b1ee149029183a3924493cb055c40812cb8a15adf054f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5069 9296 bytes
font_02_sfnt_off0000706a.bin
fcd8d123cc0e886cba779616d3d5b86ce5851d0081c8a48a60fda5f3eda96d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 3608 bytes