Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5048b219d89fd71…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 16:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c49054a9ccb0c88dfb432645c2a7776 SHA-1: 38fc397df9021b298281c1b84bcac93dfc5df792 SHA-256: d5048b219d89fd71e272b80b41fc203b74a0648b6b57c19da01432d741e552f7
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to other PDF files hosted on Shopify, characteristic of a link farm. One of these links, however, redirects to a known malicious domain. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several benign Shopify URLs.

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=dark+souls+3+top+tier+weapons
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/8570351767.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/59799350883.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/census_2011.pdf
    • https://cdn.shopify.com/s/files/1/0435/5057/2695/files/24757692862.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/varotezujomuvavajigimemuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7097/0274/files/ledorerifadi.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6596033ebe41459a3f3a90c3985e06.pdf
    • https://static.usrfiles.com/ugd/b8c837_618008f2ae2d4612b1a4364c1bd7a72d.pdf
    • https://static.usrfiles.com/ugd/cc089a_60de64c0f4ae4f9caa7fc4024b63e7f5.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8827/files/namojovakiwilalinofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/adhyathma_ramayanam_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/mepabumakaxek.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/abac_spinn_air_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/31471102270.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_off000060b0.bin
07faf63c85764c509f862f61578d1b530ed47a7910488cbbe916d74a2375527c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 5132 bytes
font_01_sfnt_off00007251.bin
d1b13458a6c485844ceb9af84aaf1f3aa053504d291aff89f5e22e28b0a83ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 10396 bytes