Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf111df86e5c26fb…

MALICIOUS

PDF

58.0 KB Created: 2020-08-26 01:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d8e58de00b725aadc76451303c5f4e SHA-1: cc0eb8084ee12f5a174db047f14e07e12a38ed05 SHA-256: cf111df86e5c26fb2cc5d75acfa13c74cbab51f7fa91c5866e7f66fdb6c09d21
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same URL found in the malicious redirector heuristic, suggesting the document's primary purpose is to facilitate this redirection.

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/pify?keyword=extracurricular+activities+chester+guide
    • http://files.history.flowingwellsgirlsbasketball.com/uploads/1/3/1/4/131437689/ponutojemu-tofipex-bijitesuxuwij-todidopavaka.pdf
    • http://files.superiormachineandfab.com/uploads/1/3/1/0/131069899/8351974.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/ccm_certification_made_easy.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/android_emulator_bluestacks_vs.pdf
    • https://cdn.shopify.com/s/files/1/0434/0577/0909/files/bantu_education_act_essay_300_words.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1227/files/62991373600.pdf
    • https://cdn.shopify.com/s/files/1/0430/9601/5002/files/contaminacion_del_aire_ensayo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/franchise_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/exercice_algorithme_avec_correction.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/zarekaril.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/all_country_visa_passport_photo_size.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/suturibesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/84807214138.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_off00009882.bin
0440b92784a6ac62b455958c93ec4e9fab09c07f6b80acdcf9c932aa330c88ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x9882 5288 bytes
font_01_sfnt_off0000aa74.bin
96a0c90e79597bfb2df33bc6bf9548464d902d4c66b303c877f52472ab46af39
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA74 14696 bytes