Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a28570bbee1b33…

MALICIOUS

PDF

50.7 KB Created: 2020-08-22 13:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b68b5509c0660872e8a77040d5c6dd SHA-1: fec5747e88520fc36f54d249d7def4ef74a327f7 SHA-256: 58a28570bbee1b33d30be3e0a970ebe5fca59a5b2d34d6ee634fea707a267830
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains multiple embedded URLs. One URL points to a known malicious redirector, and the document body itself contains numerous links, suggesting a link farm or phishing attempt. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination.

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=amaranthus+hybridus+l+pdf
    • http://files.genuinecollection.ca/uploads/1/3/1/3/131379042/rarafara_fumojazamelupok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/parts_of_air_conditioning_system.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/mist_fmge_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/80099842019.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/31779497995.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/wharton_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/96119187888.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/xipirokozusasagugobivafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rakapadanixip.pdf
    • https://cdn.shopify.com/s/files/1/0462/4351/2474/files/ccleaner_pro_apk_full_version.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_off00008764.bin
b6f4027cd0e25dd09aa7b79741c7d8f181a5754ad065da0ee835f2d6d906ed11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8764 5512 bytes
font_01_sfnt_off000099ec.bin
14e9866022db582d9de4f2b3d977eb1fe7f43d04a1d210b410ad5f22b2598433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EC 10748 bytes

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