Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf4e1c30f3d0090…

MALICIOUS

PDF

45.7 KB Created: 2020-08-18 23:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1117f4a52851f5908edba8a147f4731a SHA-1: 2c794b8a6cea781f8c54918f5550aaf08c350c8d SHA-256: 8bf4e1c30f3d009097ea2e6296fe60706efd4cda11d36ace1ec626f0c11dece6
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to a potentially malicious application or service. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector 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/pify?keyword=best+pic+editing+app+for+android
    • http://jatovifa.uncagedventures.com/uploads/1/3/0/8/130874519/xesapat_laxezexodoxa_gosekebijotuxim_xidotutoxer.pdf
    • http://vezawuza.i-yes.org/uploads/1/3/1/6/131637016/95638.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/56797575196.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/sevepuwusamemivu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/75271026852.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/15229460593.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/86609473152.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/65014459732.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/disawiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/good_agronomic_practices.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/14420091266.pdf
    • https://cdn.shopify.com/s/files/1/0435/3828/4696/files/nuvunitoporu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d2.bin
eb1b99aeac7ba95295da8dc4183585037f8d64d7b86111c9257d5c59c5c02404
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5128 bytes
font_01_sfnt_off00007950.bin
9c9ee5b914e3debad26677994c569950f9241e70dbcb7089df00936b1d238a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x7950 10092 bytes
font_02_sfnt_off00009be6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE6 4324 bytes