Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df13697bd6ca863…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 14:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5608d761e36082ef6113756b0ed6618 SHA-1: bd6c65955f2de522839d98822c7a1652ba0c147d SHA-256: 8df13697bd6ca8630f0c1b951b8fdac1e027e2fd3ec925595c467525f1474b4c
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting the primary intent is to redirect the user to a malicious site, likely for phishing or malware distribution.

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=arithmetic+progression+test+class+10+pdf
    • http://files.hartfordaoh.com/uploads/1/3/2/8/132814935/9093376.pdf
    • http://gumifusos.mounttaborbaseball.com/uploads/1/3/1/3/131383483/e2783ec49cd85d0.pdf
    • http://weturod.msmorales-chemistry411.com/uploads/1/3/0/7/130775732/naxavuroweresabox.pdf
    • http://wuriw.dhopusc.org/uploads/1/3/0/7/130740141/459719.pdf
    • http://files.darkhorsespirit.com/uploads/1/3/2/6/132682802/8c23e73d.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5764/files/24886527810.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/starting_a_online_business_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/como_acoplar.pdf
    • https://cdn.shopify.com/s/files/1/0440/8419/9574/files/cambridge_ielts_vocabulary_english_to_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/thomas_mann_os_buddenbrooks.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/renukorozenogizike.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/viruxisim.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/dexetupunijad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/56691465155.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/68986032742.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/63874349178.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_off00006be4.bin
93debe674d5f166dc372eaede37bf65a5a0824dfb671e4f5df1fd370aa1f6a3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE4 5752 bytes
font_01_sfnt_off00007f54.bin
ff1bee8808474790a170cf5c7080958b81a6908d6e0e0ababf4d129552dfdb99
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F54 12132 bytes