Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8a96a2d423587f…

MALICIOUS

PDF

51.9 KB Created: 2020-08-07 16:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1080daa3048a202295de5988bbec58df SHA-1: d2182f63b8dc65ffa23b096f5a0fbc092624f885 SHA-256: 4c8a96a2d423587f8d7fa7b17440f490949390ca7922544b671eac4ac8872055
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=1000+psychology+facts+pdf'. Additionally, it features a PDF link farm heuristic, indicating mass external PDF linking. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=1000+psychology+facts+pdf
    • http://files.paulabarbercoaching.com/uploads/1/3/0/7/130776858/mufelubisulebiwuf.pdf
    • http://files.surfdontfall.com/uploads/1/3/2/6/132683334/nekorojatirudosowuva.pdf
    • http://files.educfrontiers.com/uploads/1/3/0/7/130775676/2c159.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/puzakirefumaxoxesufasegog.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/gelesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/27728749311.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2730/files/zovisodotibusaset.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/18299840323.pdf
    • https://cdn.shopify.com/s/files/1/0428/8335/0687/files/machine_learning_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/dusekonarilabisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/rubefup.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/c_how_to_read_a_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/the_concierge_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/2312072145.pdf
    • https://cdn.shopify.com/s/files/1/0454/8021/4678/files/character_development_sheet.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_off00008c0b.bin
ba4f7cc78adf3793942bb6852f0cc75a1dbae6b12db0ce480b85f758e50b2272
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0B 5520 bytes
font_01_sfnt_off00009ede.bin
d6a297289611c2f19e72cdea7b3cd8a00a36f8abb04b49bb36ffb77ca1fc6062
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDE 10424 bytes