Malicious PDF — malware analysis report

Static analysis result for SHA-256 605adbb285ccab16…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 00:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74bd406e5c4e83bf9148f9b74fa05019 SHA-1: e610389db044f7d38ee2bcec42c6be99ca8f176d SHA-256: 605adbb285ccab167269fc19a4cfd1f373fba1fa5a3cd8cffd0f5edc1b92e188
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=exogenic+processes+worksheet+pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'exogenic processes worksheet pdf'. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.ru/wix?keyword=exogenic+processes+worksheet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1309/5073/files/55959609827.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2402/files/nupizimatinujetili.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/72659332441.pdf
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/gibagub.pdf
    • https://static.usrfiles.com/ugd/6f58fb_2ce976ed61b14ca08937e5ba15b18375.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97a4c2bb7ae48c3aba4fe4fdf46d109.pdf
    • https://static.usrfiles.com/ugd/3cb679_f8ebd3a12ed84f3fa45b38c6a39ed937.pdf
    • https://static.usrfiles.com/ugd/0d2908_9bbf2b6a8f0a451cba5c5f8c3d451bf8.pdf
    • https://static.usrfiles.com/ugd/b916f4_b301a75b7b4043c8a9a592e14b750bcd.pdf
    • https://cdn.shopify.com/s/files/1/0465/0870/3894/files/add_footer_to_excel_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/86355762712.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/gangster_bengali_movie_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0448/2777/1040/files/coping_with_grief_and_loss.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/nuzigopowiwoviz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006095.bin
11c0d40c4d428287ded17649d9776918d57d7df731eec56288ba15f6dfcf5b12
pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 5356 bytes
font_01_sfnt_off000072f2.bin
02d68c20bcc30a97c0e82f2e9662fe0336513ffc964b2acd77639bc7ee99a72a
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F2 9908 bytes