Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb2f0be9b51535…

MALICIOUS

PDF

40.1 KB Created: 2020-08-25 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bccf04bac035a28bac286b4de1acae2b SHA-1: d9ba0ed9aa45c4edee07a35dd13ac035bea02c7f SHA-256: 77bb2f0be9b5153534cf848c69733197a11f15a8a7d1556ab6e8d215f035df16
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains references to 'osrs skiller guide' and the malicious URL, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=osrs+skiller+guide
    • http://nakavo.vallenduuk.pl/uploads/1/3/1/0/131070382/labolilasuk.pdf
    • http://files.voxelquest.com/uploads/1/3/0/8/130873735/pewobaletitonulum.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/rexoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/78413354401.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/sapafafijuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/rpa_robotic_process_automation.pdf
    • https://cdn.shopify.com/s/files/1/0461/9586/7797/files/astringedent_safety_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/vinexarukiduzewiref.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/adjective_worksheet_for_class_3rd.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/zexidiwuwixirubas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/22619216597.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/sozowiwixiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/45695514457.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/34477142797.pdf
    • https://cdn.shopify.com/s/files/1/0434/4161/9100/files/36920849018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000615c.bin
7daab35bcf7a4af58764acd5faef6a9b60acde1630f2d1c3384b8ed62c25d051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615C 4876 bytes
font_01_sfnt_off000071fe.bin
d16d93bd87e5bae5e83edc3b0ed0fecc94a76a0ea843a432939f24218154f027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FE 10012 bytes

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