Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b468f6e744fe59…

MALICIOUS

PDF

34.1 KB Created: 2020-08-31 12:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3dc6d93793b82068a019b9c3a3eb6a8 SHA-1: 9e1ceca47635bf5e2cf94f5acf527c1349a6a04e SHA-256: 85b468f6e744fe59e817c27adc3d3900f9c927ffe4b4bf79d790ba7fe7c276a5
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL 'https://ttraff.cc/wix?keyword=native+science+natural+laws+of+inter' is identified as a malicious redirector. Additionally, the document contains a large number of links to other PDFs hosted on 'static.usrfiles.com', suggesting a coordinated effort to distribute content or lure users through a deceptive link structure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=native+science+natural+laws+of+inter
    • https://static.usrfiles.com/ugd/784815_1dfed95113fc486ab06ab08aca60132f.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_df9b503aaf574af2a8ffe7bcfd125bf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d1f8fe4a33d46089843b871d05a5bbf.pdf
    • https://static.usrfiles.com/ugd/e745be_131b7ee3df8f4220a732fca96c72f352.pdf
    • https://static.usrfiles.com/ugd/51c472_0dbd6c54d42f4dcc9a7c89871d4d9f97.pdf
    • https://static.usrfiles.com/ugd/77941b_303d4035adca40039cfb7b2ca7ef3f26.pdf
    • https://static.usrfiles.com/ugd/b8c837_7df349b8dad545d58ed9b50e11a55cc5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/kizikasukigis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/literacy_narrative_outline.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/wepeporejejab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/filidezumeziduliruluxer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/86968650978.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/2020_and_2020_academic_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0459/9077/2895/files/android_studio_button_onclick_method.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/jazejetafoxome.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/85609319178.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/mojonuwuxezupodajavotap.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_off000049f2.bin
a5d41a398699bc00857daf5012b9714bc12c41b1840c5aaede15d8fac38a9bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49F2 4996 bytes
font_01_sfnt_off00005b1d.bin
1bb6cb737ca1aef2f68815688ee69eeee7cf293aea75ca5ff1ae900829016446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1D 9644 bytes

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