Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8963f21d1ce5abd…

MALICIOUS

PDF

38.9 KB Created: 2020-08-12 20:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eff549504291d5ad5d02952eafaa619 SHA-1: 7239ef9eac78cd2f83dc0fede376b4c7b088cffb SHA-256: b8963f21d1ce5abd7d6e54703515a5126f3d13864566da62b5f61677598c13ee
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious domain, disguised as a free download for 'iit jee chemistry notes pdf'. This is further supported by heuristics indicating a malicious redirector and a link farm designed for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be directing users to malicious infrastructure through a deceptive lure.

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.cc/pify?keyword=iit+jee+chemistry+notes+pdf+free+download
    • http://pusabajaw.stalag.org/uploads/1/3/2/6/132681670/megapofabafonewat.pdf
    • http://fekalo.unitedsafes.com/uploads/1/3/1/0/131070867/dd4e43367c.pdf
    • http://files.goodstuffprimaryresources.com/uploads/1/3/2/6/132681204/lamumolop.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/livro_argumentao.pdf
    • https://cdn.shopify.com/s/files/1/0445/4852/2143/files/applied_data_science_with_python_and_jupyter.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/tawepijug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7618/9346/files/nimamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/2652934476.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7822/files/97101872063.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/sulaseziberukodarajug.pdf
    • https://cdn.shopify.com/s/files/1/0435/1452/7908/files/zizugunoxetololumunasuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/4405584059.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/bisuxejovolave.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/setex.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_off000057f1.bin
9d5e1fe27eb8ac34aaab02d794224d34130b0ebe2a051ade0292c03c235ac255
pdf-font-stream PDF embedded font (sfnt) at offset 0x57F1 5600 bytes
font_01_sfnt_off00006aeb.bin
b6aa3c9941cf0fc192210b7e64d63ec9e62395cabc17c2528e0d7e959e8b62eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEB 10408 bytes