Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80ebaaf23790d6f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 05:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6e601ce05d90002db196e70472afeb SHA-1: 4357d4e998ea0623111b37768f466fdfcc20c57b SHA-256: c80ebaaf23790d6fd202b358e0b4f3517a1565780bdf65d5167c317f679cda33
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=joining+report+for+assistant+teacher'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, including one hosted on Shopify. The document body, though partially obfuscated, contains the same lure text and URL as the redirector, suggesting the primary intent is to trick the user into visiting the malicious redirector.

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.cc/pify?keyword=joining+report+for+assistant+teacher
    • http://files.bolbi-edu.org/uploads/1/3/1/4/131437878/xaxuxuxalu.pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.anthonymichaelscatering.com/uploads/1/3/2/6/132695472/f8f39.pdf
    • http://files.andersonpsychassoc.com/uploads/1/3/1/4/131410234/lojet.pdf
    • http://files.andersonpsychassoc.com/uploads/1/3/1/4/131410234
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/fedim.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/famizagedupud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8209/6541/files/cadillac_srx_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/7783298759.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/automotive_software_engineering_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/wekizabelakogujisubazako.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/52222866442.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/3378384739.pdf
    • https://cdn.shopify.com/s/files/1/0430/9083/7655/files/belle_de_jour_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonixalekena.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_off0000634d.bin
e66f3731b347021628fea9bc35864f800eb68cbe0ee2c256cd831c4d719fc1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 5236 bytes
font_01_sfnt_off00007510.bin
a9f3a189663f500d705c53b8b99a9d708e172a4a1067b439aaf353dac58f947d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 9836 bytes