Malicious PDF — malware analysis report

Static analysis result for SHA-256 3930d1994b8d7b2b…

MALICIOUS

PDF

46.1 KB Created: 2020-09-02 10:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca8b8b7ae772b08b7249a21c6fb37b4a SHA-1: bd070b92c43785788bb03264af35e61ba28ca8b2 SHA-256: 3930d1994b8d7b2b6ceabbe305ec7265a55678957d6b3f98a74ba9043836ae50
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for calendar templates, directing users to the malicious URL. 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.me/wix?keyword=calendar+template+excel+december+2018
    • https://static.usrfiles.com/ugd/824332_92bd189007f64c6697b96afc46895f80.pdf
    • https://static.usrfiles.com/ugd/f46427_0b53920294e04949b53f7e568fd7150b.pdf
    • https://static.usrfiles.com/ugd/98e298_bfd66e3f35c6403fb9984e6015d35f4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_84a0b93aa568496e8e1fa3454ffecf22.pdf
    • https://static.usrfiles.com/ugd/0e2875_aa8de1ee1ddb407fa7cf187253f7603c.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6388a728aec44fb688db41c777848d24.pdf
    • https://static.usrfiles.com/ugd/4bb894_5eaae971963d45708184cc6da8a0fcf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff10f24e6597413396d47af256bffd89.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c241bf2bd904e6089d9dccdb7324562.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/mubofaxawujofuxo.pdf
    • https://cdn.shopify.com/s/files/1/0449/0631/5931/files/contrato_consorcio_bradesco_automovel.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8131/files/86804250548.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_off0000687d.bin
a2a9e3d79de12941a6250de8e528e35064339918342ca78ab53fb518c1f25f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x687D 5420 bytes
font_01_sfnt_off00007ad7.bin
819e5e238158a911b8d6f8da770d581b4606e4f1d080ee724ed4c37eb4d34ce1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD7 10024 bytes
font_02_sfnt_off00009d3b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3B 4324 bytes