Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9665ff3a31cc8ca…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 18:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ceb009d2b979766bbaf06bfd4d668a SHA-1: 0ac1677422feb946a5fa92ec0a5209b546a21eac SHA-256: b9665ff3a31cc8cac5821818712e8f0ddc949d95d9431f757a30d9562a7d3339
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector at `https://ttraff.cc/pify?keyword=characteristics+of+good+research+topic+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=characteristics+of+good+research+topic+pdf
    • http://files.aldrichmachineworks.com/uploads/1/3/0/7/130774990/xivufo.pdf
    • http://files.fridart.org/uploads/1/3/1/8/131856827/jelovadasev.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/81841920727.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/damm_small_linux_iso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/44866476503.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/23532375010.pdf
    • https://cdn.shopify.com/s/files/1/0428/3616/4774/files/48577149842.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/dagowuxumavuxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5084/files/lalugadodufafolas.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/44238867033.pdf
    • https://cdn.shopify.com/s/files/1/0433/7064/3614/files/venture_brothers_season_6_episode_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/4237/3785/files/bogisorodofibonot.pdf
    • https://cdn.shopify.com/s/files/1/0440/6152/4118/files/39399252342.pdf
    • https://cdn.shopify.com/s/files/1/0440/6493/1992/files/14170906078.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/gopifivese.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_off000068f6.bin
eac95f7ddaefc1d08215dc3cfee4f6421e51706efdf4ccb44c0483e9816c7f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F6 5292 bytes
font_01_sfnt_off00007ae8.bin
622b551917295d0bbdb5a1d1438a473d726fc9543dc625f3ca93611d2dcb5069
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 9868 bytes