Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c74f8cda836da6…

MALICIOUS

PDF

42.6 KB Created: 2020-08-04 05:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 084a68c042097a2dd94e915a1261ded9 SHA-1: 089f8cafcdd48afa66272b5fb56cd956b44588ae SHA-256: c8c74f8cda836da6f7d767d98de3fe30aebc0e3f6037a4a525aa2c007bf8b4d7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic firing indicating a redirector to known malicious infrastructure. The document body, though heavily corrupted, contains text related to a 'free download' lure, which aligns with the malicious redirector. The primary attack vector appears to be social engineering via a deceptive link, leading to a malicious site.

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=learn+arabic+language+through+tamil+pdf+free+download
    • http://files.teledrama.org/uploads/1/3/0/7/130775675/909904.pdf
    • http://files.pineapplefibreart.com/uploads/1/3/0/8/130814666/9d25c2f1.pdf
    • http://files.slotattoo.com/uploads/1/3/1/4/131407547/xiwemizun-xibejetozokal-gusisilojowojon-xufibiloxodo.pdf
    • http://files.carpets.casadedios.us/uploads/1/3/2/6/132681308/1015.pdf
    • http://files.artedwards.com/uploads/1/3/0/7/130739415/vanezitujosano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuxojusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/gunovowad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9581/files/star_wars_mount_and_blade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/63725885707.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/tokosadopidulitepuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/45259736683.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/7845939647.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/solidworks_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/37245101291.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/kivegujeniw.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/64895471095.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/59993300257.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_off000067b2.bin
fc3db7d9a8bfb4834b9c48ecd2e1e3d9fae760972550865cddaeaa14b3a31fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B2 5564 bytes
font_01_sfnt_off00007a85.bin
44d15f52b6561e6fec0d2901d94f293347476a62ff08fdcb51c3895448cd32a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A85 10128 bytes