Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b55313ee2701c4d…

MALICIOUS

PDF

46.7 KB Created: 2020-08-29 22:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 518ed749cdec724772282e9dbdf46205 SHA-1: 20cd9835b1887d632bf8e6c1540dd0ec6b51c3b0 SHA-256: 0b55313ee2701c4dc59728da3db0c034213a1bdce378324ddd7ab9ddcb8f43cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a book title, which is consistent with SEO spam or phishing tactics. The presence of many external PDF links further supports the SEO spam hypothesis.

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.com/wix?keyword=the+complete+book+on+angular+2+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/miller_rabin_primality_test_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/10542793227.pdf
    • https://static.usrfiles.com/ugd/a59130_e3b06a35c4ec445e85b538144176d7d6.pdf
    • https://static.usrfiles.com/ugd/a107db_a329510d6104461cac0e1a9ba075b1bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_b461b6dd628a42a699721933b605193d.pdf
    • https://static.usrfiles.com/ugd/c0b427_d1de3432c55e4c3e9b1db611fc45e6ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_01350624d564410a9325967221662428.pdf
    • https://static.usrfiles.com/ugd/26481d_27804fbddbf643af9943d7a04361a946.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3f949724bc44307b287ca0525c7a590.pdf
    • https://static.usrfiles.com/ugd/b8c837_34660902ac7545cfbb8a3f9c8db5ca92.pdf
    • https://static.usrfiles.com/ugd/b56239_6e99191880ce40a1a974b77556dbeec8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1a9073dad9a4ebf951a0e7f5813dafd.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/60812165326.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6003/files/binifapobonefovife.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.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_off0000705b.bin
1e77827521e579a53082265748323b578cf3dc205403dee9ddebc60f12f54160
pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 5676 bytes
font_01_sfnt_off0000837e.bin
45b83fb5fc2da4a3739935e47d750b50d3e1b93fbf67091732002bee0c573824
pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 12940 bytes