Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7dd0ac971805df…

MALICIOUS

PDF

71.5 KB Created: 2020-08-21 20:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3366f22e7b5a65e4cb097f102357f361 SHA-1: 19127471280c5f597321ffd0d823425dc5bcf5e0 SHA-256: bd7dd0ac971805df52d7dd15166e3a32a854fba0f87884d8a0eb079f74718530
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=card+city+nights+2, which is a known malicious redirector. The presence of numerous links, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to distribute malicious content through seemingly benign platforms.

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=card+city+nights+2
    • http://sexap.glavezzisculpture.com/uploads/1/3/1/3/131397987/xowoguzane_jodujax_nawakufomijem_jasalovijedifak.pdf
    • http://files.boardads.org/uploads/1/3/1/3/131383619/tikogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/pamejuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/62051247636.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/18017209756.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/memerobanogoxex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/viwira.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0432/7348/6496/files/dopelipodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/11522953860.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/kiweliziwukesisezazufi.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/kexusofudagedopaguxeputo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/ragubudufefiti.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_off00007037.bin
ca9462dc59efb4cf3435cf51c7191de0edad26ab08a2c7cd241122062883ed0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7037 32040 bytes
font_01_sfnt_off0000d3d4.bin
033a4f2d345be69f9218bdefea2d7c663488f48083cd8190264fc4d96ff0f8da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 5308 bytes
font_02_sfnt_off0000e5e1.bin
f1d0c4e123718bd503389bfbb5fd36f0a0028dac308070eed39d7e3dca494662
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 12536 bytes