Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9b6020b8c02cd0…

MALICIOUS

PDF

34.7 KB Created: 2020-08-08 13:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27059f6f09f72236b58d3f15b1fa07a4 SHA-1: 43dd7e83c6606313e868899207b3ac9a5dc38bb0 SHA-256: 7e9b6020b8c02cd08cd2507df9ad0006f0eb7cb858076145713a2b24a9e625b3
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text "Principles of accounting pdf noun" and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous links to external PDFs, many hosted on Shopify, indicates an attempt to appear legitimate while directing users to malicious infrastructure.

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=principles+of+accounting+pdf+noun
    • http://dapumid.toddphillipsmusic.com/uploads/1/3/1/6/131607062/7851807.pdf
    • http://files.foxwoodarabians.net/uploads/1/3/1/6/131637135/3bca9a7e6bcf6.pdf
    • http://ponena.yohmansgarden.com/uploads/1/3/1/8/131856158/141cd815cc2f.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/research_methods_in_psychology_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/76584735622.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/10093533341.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/gunedutozelagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/71611440142.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/xutazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/63806121864.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/zutupamujegupurofusutatu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/bitevinonugonemiperi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/35171486968.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/amsterdam_metro_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/6493/3014/files/goxalozizikitipu.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_off0000481c.bin
f0da3e5d742d4004db0ffeb23dfd2c779d4f015faa59cacb06c99c34d766c0af
pdf-font-stream PDF embedded font (sfnt) at offset 0x481C 5324 bytes
font_01_sfnt_off00005a43.bin
570c9e067ac22e676a0327132de57fed57161423823cc1589ef7d27381b48648
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A43 10096 bytes