Malicious PDF — malware analysis report

Static analysis result for SHA-256 85160ece466b1d2d…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 21:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3015dbc941a32d89bceccfdb9ca079fd SHA-1: 30f0254cfd017f09439c2aaec04517f70b0f43dd SHA-256: 85160ece466b1d2d6dd124eaf9363fac3da69a4109d488bcbac70a218a90cdc5
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on cdn.shopify.com. The primary malicious URL is https://ttraff.cc/wix?keyword=ielts+deneme+s%25C4%25B1nav%25C4%25B1, which is likely used to direct users to a phishing or malware distribution site.

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=ielts+deneme+s%25C4%25B1nav%25C4%25B1
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/40206192808.pdf
    • https://cdn.shopify.com/s/files/1/0431/8170/3319/files/dimojodisupo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0648/files/avery_template_5160_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/macbeth_revision_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/kagalujurawojobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/9714456865.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/tufevexawomob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/auditoria_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/15206424108.pdf
    • https://static.usrfiles.com/ugd/4b874d_407802b06718477b8f2cbc6614a4cdc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a16ebf45c6f4872b41395cd4374f90d.pdf
    • https://static.usrfiles.com/ugd/b8c837_73a80f57492649dd8f59a51421ebdead.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67cc1a50274440aa9e2f9275bacda63.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_off00005d92.bin
66bf38ab0d9c6fb202a88df81ec292995cf775a8bff079622cd5cb4b342278ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 4904 bytes
font_01_sfnt_off00006e2a.bin
b9ddc515e7a5ddd84b009d0ccec8ea2d3ba027678e5e0f97e1ee61896c010b84
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 11096 bytes