Malicious PDF — malware analysis report

Static analysis result for SHA-256 445fc072e6ef4376…

MALICIOUS

PDF

71.3 KB Created: 2020-08-31 08:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1435c3abdbd4444c9f87185ef15e6217 SHA-1: 6182d4d5c147c715ec53d8471491577c53c26c8c SHA-256: 445fc072e6ef4376145873eada6bb14d32e145bd2932c94d51a26ce94716218a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a textbook and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the PDF structure itself did not reveal further malicious intent beyond the link.

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.me/wix?keyword=real+estate+principles+a+value+approach+5th+edition+solutions
    • https://static.usrfiles.com/ugd/136d07_d0b4ce87a1554f05a0be7168f9febaa2.pdf
    • https://static.usrfiles.com/ugd/5b9a87_6deeae65a6c14157a54e0921bad6a17c.pdf
    • https://static.usrfiles.com/ugd/003b86_60822f197b7e495f9abaf91c40ee43da.pdf
    • https://static.usrfiles.com/ugd/e3325f_92af157a2387448e8035b3c6b89edd65.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/40700398564.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/aashto_standard_specifications_for_bridge_design.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/47770158899.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/abadi_mt_condensed_extra_bold.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/bumamozerutonidepu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/addictions_a_banquet_in_the_grave.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7069/files/vuxiperadarinezaradukuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/puvoruzubov.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/20633946460.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_off0000d970.bin
d3457d59a0efa69222e5b761f59a39fc42a17d14d0069759bc511630e59d4e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 5352 bytes
font_01_sfnt_off0000eba4.bin
86b89ef10f7157371941361428e1402756cc3d742d9411198d3f373bc40736f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10536 bytes