Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8065511c250d730…

MALICIOUS

PDF

47.8 KB Created: 2020-09-17 00:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037e896092045dc38d2bd2e10ca7ba27 SHA-1: bc6f1ecbe12ba24445d498b55c5e23d67b919f8c SHA-256: c8065511c250d7304273465e385cee7160182d105b845a92d596073967b04378
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.me/wix?keyword=types+of+welding+gases'. Additionally, the PDF is flagged as a link farm, containing numerous external links, with the primary one being a Shopify URL. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and a benign-looking title related to welding gases, suggesting a lure.

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.me/wix?keyword=types+of+welding+gases
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/9th_grade_common_core_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/zemovasokusinelazijubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/zuponoworob.pdf
    • https://cdn.shopify.com/s/files/1/0435/1836/1755/files/19602640813.pdf
    • https://cdn.shopify.com/s/files/1/0430/7137/3466/files/star_trek_voyager_technical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/78370012055.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/zogowevunimodogogom.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/iphone_xi_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1846/files/berklee_ear_training_workbook.pdf
    • https://801731bc-8c18-4763-8123-cfc14283eb4a.filesusr.com/ugd/bb3bf9_4524cfd6b4544b5a8fcf3dddb192019e.pdf?index=true
    • https://f4e6f434-fcef-4dd5-9665-9bd9598de177.filesusr.com/ugd/4479ed_d0dbecdfb3b0442f8197e67e6ad14d61.pdf?index=true
    • https://2ac80d2e-17ac-40ef-98a0-62b95f0a236f.filesusr.com/ugd/724bd4_04b9c01749544cd9a5f4e172e6dc8985.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/sample_student_autobiography.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/lumuturulugukoxikojune.pdf
    • https://cdn.shopify.com/s/files/1/0439/4971/9720/files/pewubuviwetanalonilugag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a7.bin
be33ff45195f94685e028fe0c8cb80474caa17a9fc9f36f7b4e0fe60620f2dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A7 4964 bytes
font_01_sfnt_off000081b7.bin
2aa30cb52cb060619126b6cf0677a858448f04e9fbf66178e94ceb0ee4c9d157
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B7 10048 bytes
font_02_sfnt_off0000a409.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA409 4324 bytes