Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7c82960c6f9fbc…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 06:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f699997239eaf85ae0990cc0ce47f4b2 SHA-1: 1db4ceeb5fcd10b80fbe194ce720951ea1c4018c SHA-256: 8c7c82960c6f9fbcce58318780edf87a042c5f64bc63720009708b40d90a1f6e
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, likely intended to lead the user to a malicious site. The presence of numerous external links, many pointing to Shopify domains with numeric slugs, suggests a tactic to manipulate search engine results or distribute malicious content.

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=free+spelling+test+template+pdf
    • http://files.mgreenclassroom.com/uploads/1/3/0/7/130776592/2764684.pdf
    • http://diberozo.ccdanbury.org/uploads/1/3/1/4/131438888/pefuto.pdf
    • http://files.magdalenaallnatural.com/uploads/1/3/2/6/132682905/lofixad.pdf
    • http://files.soulvisionhealing.com/uploads/1/3/1/6/131606630/c985de6.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/32592010453.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7885/files/niwodezapuwuzofos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/macbeth_graphic_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/cambridge_primary_science_activity_book_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7495/files/xipibirazuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/86707380388.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8075/files/49181594438.pdf
    • https://cdn.shopify.com/s/files/1/0430/0754/1401/files/minecraft_how_to_reload_chunks.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/bodybuilding_program_for_mass.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/26694181751.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/jigowimaziwuribapima.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lithium_ion_polymer_battery.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_off00006964.bin
cb6bae2a8ee623aab3c038cb157b01625877e3cd2aaa864a23f534963df77814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 5316 bytes
font_01_sfnt_off00007b60.bin
c863963df0fe2641d807efc823f5b7edb767593a5921045555d4a7afd32f7469		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 10216 bytes

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