Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7e9fbbdcdc1f04…

MALICIOUS

PDF

42.9 KB Created: 2020-08-08 19:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 244752f0d59feefd7b11bc8905db1b61 SHA-1: 9d375325a7621defd09a03a6bf5e5179b29ebbf7 SHA-256: 8c7e9fbbdcdc1f040b82b6d15ebe07f41762bc937c349e8ec9ad7dec0a396040
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=bhagavatam+pdf+in+bengali', suggesting a lure to a phishing or scam page. The presence of numerous other links, as indicated by 'PDF_SEO_LINK_FARM', further supports the malicious intent of directing users to external, potentially harmful, content. No scripts were extracted from this sample.

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=bhagavatam+pdf+in+bengali
    • http://files.francescotoffetti.com/uploads/1/3/0/9/130969080/1c375e.pdf
    • http://files.opheliafinke.net/uploads/1/3/1/4/131454523/vomaro.pdf
    • http://files.golovanortho.com/uploads/1/3/1/6/131637385/1d9845114fb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/78583699802.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/kemevovumirizidaxux.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/sigebis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/19939110601.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/effective_communication_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/zemug.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/dexojemunuvefaxeteru.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/bistro_romain_carte.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/adobe_acrobat_pro_dc_editor_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/phonics_and_phonetics.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/fijefugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/nominal_ordinal_interval_ratio_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051cb.bin
100d7ffea390f64ef0edc414459ffd2f67a7ce794a5b02aff1ca4b544809c38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CB 5432 bytes
font_01_sfnt_off0000642e.bin
d5fcc002b2b37770773f3b8f80ba7ec0616325f9e1da36dc32ef1933921d8e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 7940 bytes
font_02_sfnt_off00007ca5.bin
b8697be8b323775332f43a13a265ed2216d8b3b6d80afb1a7663b0d082d56928		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA5 9924 bytes

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