Malicious PDF — malware analysis report

Static analysis result for SHA-256 1880c16486efde4a…

MALICIOUS

PDF

46.5 KB Created: 2020-08-29 20:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eedde93597a34e3bcd485ce21a7ad9d SHA-1: da6638aad4181058625220ddf09ee62441804fee SHA-256: 1880c16486efde4ab9e1c1be3a2b45c769b829c7dbbc5bdbd05df7116a59fe52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm hosted on Shopify. One of these links, https://ttraff.cc/wix?keyword=flores+en+el+atico+pdf, is flagged as a malicious redirector. This suggests the document is designed to direct users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=flores+en+el+atico+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/todixeguwopitigaxuwopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1015/files/foundations_of_logic_programming.pdf
    • https://cdn.shopify.com/s/files/1/0428/6054/4156/files/ximata.pdf
    • https://static.usrfiles.com/ugd/b8c837_b63ab28da6b54445acc7164b03dcbc32.pdf
    • https://static.usrfiles.com/ugd/b8c837_c19c82a0563047439be110d3bad8ad8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6bac8e5f8da4609a8e6fa286ba4fc92.pdf
    • https://static.usrfiles.com/ugd/4d400c_6ea15f648e1a42b595b12eaa2517110a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/modern_x86_assembly_language_programming_32_bit_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/razakotetirijakosuzizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5333/5207/files/1873783818.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/el_solitario_horacio_quiroga_caracte.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007721.bin
c70a9b856e04c94cf10e6b83e1019808030729f30d48be2ef0edaaf8dfaab6dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 5104 bytes
font_01_sfnt_off0000888d.bin
7464f0efc9c6f66524782be991096fb62649a1820373a82b8fee5c47d417c913
pdf-font-stream PDF embedded font (sfnt) at offset 0x888D 10928 bytes