Malicious PDF — malware analysis report

Static analysis result for SHA-256 de34c79b578e20bf…

MALICIOUS

PDF

42.7 KB Created: 2020-08-14 05:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159a21750f448a5d8417618ae8039ee7 SHA-1: a24663f142019a71685ed29ec55d4867942476d4 SHA-256: de34c79b578e20bf1370767cbc19d6e558b2fb3e935e2478d0a76e5ee75b5a21
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link redirects to known malicious infrastructure via 'ttraff.cc'. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into downloading further content or visiting a malicious site under the guise of a risk assessment template. 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/pify?keyword=food+defense+risk+assessment+template
    • http://files.slofamilycounseling.com/uploads/1/3/2/8/132816165/newamovowa.pdf
    • http://files.smallwonderskennel.com/uploads/1/3/1/8/131856723/gofidonovesa.pdf
    • http://files.eaglehealthinsurance.com/uploads/1/3/0/9/130969818/8c5ca.pdf
    • http://files.museautoproject.com/uploads/1/3/1/1/131163712/2e795935a93c9b8.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/career_paths_law_express_publishing.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/75351302149.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/sadibila.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/credit_card_authorization_form_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/ganudafexejo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/diario_de_navarra_portada.pdf
    • https://cdn.shopify.com/s/files/1/0434/6629/3401/files/nedesazawexikepoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/bujomupiwizer.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/zojibib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/xexiterilebaluginufetog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6594/9862/files/vexijowilizaza.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_off000069e6.bin
88e6ecf36b50a77dcb30fb16d16bf1ee34b5fd289635822a971e6d7ff89a3557
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 5204 bytes
font_01_sfnt_off00007b8f.bin
4b53e56645c3d3fe755deb1371b416e9ecd7e51d303eb4848b468c8457e5ec60
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8F 10080 bytes