Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4ba52b2bb4ba7e…

MALICIOUS

PDF

39.6 KB Created: 2020-08-19 21:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e2bea732fa379e214945132c5329bf SHA-1: 0e88d8257e5fd3f83180bb464aedc68431c65599 SHA-256: ba4ba52b2bb4ba7e3d910b50e8914814c09c5da9d6459c40e67e4b250ee8a48d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one identified as a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

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.ru/pify?keyword=dagannoth+mother+guide+osrs
    • http://files.melodywagnerforstate.com/uploads/1/3/2/7/132740260/7313776.pdf
    • http://files.lyrichillfarm.com/uploads/1/3/1/0/131070374/25fadc3d8.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/fusik.pdf
    • https://cdn.shopify.com/s/files/1/0456/8258/9855/files/54133039729.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/website_scraper_php.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/80167735291.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8890/files/cortes_de_carnes_rojas.pdf
    • https://cdn.shopify.com/s/files/1/0436/9101/6347/files/24004330734.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gerakofidasetivivirodipel.pdf
    • https://cdn.shopify.com/s/files/1/0440/8426/5110/files/76326908260.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/78487129617.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/46149189231.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/architects_data_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0448/4818/5501/files/61967327305.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_off00005cc3.bin
80225ae3ba4c2dbf3810e6979c9ade6f09040e6b94d132b76941e6564bc3b005
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC3 5204 bytes
font_01_sfnt_off00006e47.bin
b5a03f3441cd53c2840061f2469fd181ef362fa94870b85b275c92a308c8aee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E47 10420 bytes