Malicious PDF — malware analysis report

Static analysis result for SHA-256 34912d84d19793e8…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 18:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a11cbb14348a2300fb0bf8f37210d18 SHA-1: e55c5e364ff370291315165bae75d382813ab838 SHA-256: 34912d84d19793e8bcfc9f47b7a9eb215caaafe9ea3b58e20e1e302ba17493df
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, ttraff.com, which is designed to lure users into clicking on it. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for 'new berlin businesses'. The presence of numerous other PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase visibility and click-through rates. No scripts were extracted, and the primary malicious activity observed is the redirection to a malicious URL.

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=new+berlin+businesses
    • https://static.usrfiles.com/ugd/362633_d58548149b844b3e8ac46a83c7447289.pdf
    • https://static.usrfiles.com/ugd/be19e1_5800413008694b24bc5c6d9d29a84cfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1850561e9a84fc1acdab69ed9269913.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/36f25b_77c0e226b35d41d4a8cc404abb5a00d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8ade5e9a72a46d2a013f43be6f77b37.pdf
    • https://static.usrfiles.com/ugd/b8c837_b64d46ce3954450886785b334430eb50.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6aca370f124b1b9c1597a557f422a9.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/33109642706.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3997/files/74201634892.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1908/files/reminiwevexegupoli.pdf
    • https://static.usrfiles.com/ugd/b8c837_570def4cd44b4f70a49af5a8ff07f404.pdf
    • https://static.usrfiles.com/ugd/5cf23b_2f9eab545cec4a018236bd068f93ed82.pdf
    • https://static.usrfiles.com/ugd/b8c837_3660a2cb9bf04d14a9ef227cb72b6c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_c72d4cc9d08e407a96a115c73616bcef.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c7005fbcfba4d9e8714414bc9b18814.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_off0000586d.bin
a70726b9718d102ab39e852a3827d56777ff26040533e764ae2e4ac7b5916e47
pdf-font-stream PDF embedded font (sfnt) at offset 0x586D 4668 bytes
font_01_sfnt_off00006872.bin
a094231c56a9a3cc992777c038adda36ec95c0e7c3c54c1e2a023edbe7d9eee6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 10348 bytes