Malicious PDF — malware analysis report

Static analysis result for SHA-256 de66420e51e6239a…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 20:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f5527a647aeb2a81cea703085a6054 SHA-1: 38e25722fa21abe564c56cdef16218ca8ce2eb95 SHA-256: de66420e51e6239a1f3a45212fa9feffa1cb4c77b43581e37b3c99e3674d4cbb
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the PDF structure itself did not reveal further malicious intent beyond the redirector.

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/wix?keyword=little+mix+our+world+pdf+free
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/31370870050.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/lowimiwu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/16546389916.pdf
    • https://cdn.shopify.com/s/files/1/0441/0186/1528/files/37669573121.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/64233391400.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/exothermic_and_endothermic_reactions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/tratamiento_meningitis_bacteriana.pdf
    • https://static.usrfiles.com/ugd/b8c837_14528a42e0e348f6a6ba60112970bfb4.pdf
    • https://static.usrfiles.com/ugd/8b9728_8562b07c527245b985fa6a4879da5b80.pdf
    • https://static.usrfiles.com/ugd/07ef24_3bf79adfeb6440faab294d227d29179e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec5cedd48e114c2493038d81e44ebfea.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/58888525542.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/kuxipewipolimajip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/rupinatojilugenom.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_off0000563c.bin
a8906c07922b4f4b637c0b45315bc7197187a311ff21f50ba7dd9f465c6c43d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x563C 4676 bytes
font_01_sfnt_off00006644.bin
8e48a693d3bedf870c03097028f4f218916a504fdfc920959e1fd5993d48d8af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 9740 bytes
font_02_sfnt_off00008773.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x8773 4324 bytes