Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeccdcf45e0ffb8c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-19 12:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1dcf3297a7a8c4bce929d4ef1c2f64e SHA-1: c9e28a4ab0baf3695246186f634fe6c6885f69a5 SHA-256: aeccdcf45e0ffb8c661e7cd562ad56ac8b740b96ce73063c6a0b5c3ac6dd2444
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link redirects to a malicious domain, ttraff.cc, which is likely used to further obfuscate the final malicious destination. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a social engineering attempt to drive traffic to malicious infrastructure.

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=are+robots+and+androids+the+same
    • http://files.maryvillecityschoolsfoundation.org/uploads/1/3/0/9/130969332/6ea30db0.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/lutab.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/agenda_2020_ua.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/tinkers_construct_arrow_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/almacenamiento_de_energia_termica.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/08_scion_xb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/78129998354.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/munij.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/91747468915.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_off00005cdb.bin
04750237c461d43ee3989c14cd8387b8b1eed4abe559f46fdc28f950cc284d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 5160 bytes
font_01_sfnt_off00006e2a.bin
9817026336d5ae9e90cc23061d1ecff28369e9fdc1e277973bf6ca81c125a342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 10100 bytes

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