Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bca684f34c8424…

MALICIOUS

PDF

43.4 KB Created: 2020-09-02 22:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9eb4bd33a3da832de2a6e225e383c4 SHA-1: 17109c8e3471721c78c8ff96aaf761fa4cf45229 SHA-256: 39bca684f34c8424abaf790d7e1e755caa6647b12049729f67a12e1eb6cb68fd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a government form. The document body, though heavily obfuscated, contains the same lure text and URLs. The presence of a large number of external PDF links suggests a link farm intended to distribute malicious content or engage in SEO poisoning.

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.link/wix?keyword=sc+dmv+odometer+correction+form
    • https://static.usrfiles.com/ugd/de60da_d7b52880b53e4cadb3e8107249282bdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0b9f2e80a844d1cba436aabd9056d62.pdf
    • https://static.usrfiles.com/ugd/0adedf_787e2598200343109284063db9d3c2bf.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_74e8cf71d44a4fd68f44fb7874a8ef01.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f0160318fe4fccb083ccf1df14816e.pdf
    • https://static.usrfiles.com/ugd/882da0_0acc6b508a664eafb8b128f8642a6d3a.pdf
    • https://static.usrfiles.com/ugd/cb4a18_f48c57276d4e4f0fb2965b2273814b0d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9902/files/getevekepixunipik.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/kasutuxufulopawurererim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/penanapukilirel.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/delta_flight_attendant_assessment_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/english_grammar_basic_test.pdf
    • https://static.usrfiles.com/ugd/e6092c_1d3d4b4ff52647f7b6483fc5232ee343.pdf
    • https://static.usrfiles.com/ugd/de3d83_8a7b23f54fc84bdeb5d73ad24796eb58.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_off00006bc0.bin
df4ffdc1a8c1c6708ebadbf6fe5a975a39a1970b13f5a41257068753be80fe33
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 4912 bytes
font_01_sfnt_off00007c6d.bin
7ec396f60232cd3802fcb31f681d6bf9a6f71d4b582e2fcffadb2042b1d8d69f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6D 10764 bytes