Malicious PDF — malware analysis report

Static analysis result for SHA-256 5735d3ad43c0b814…

MALICIOUS

PDF

54.4 KB Created: 2020-08-29 03:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20366797b77cf11ecf49bc76469befd8 SHA-1: 62e5d71a51acecae4eb055290fc799f63765bc0e SHA-256: 5735d3ad43c0b814ab9d14cbda0f731a7b3586b94c62a498b23fe37a9897f4c7
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 PDF files hosted on Shopify. One of these links, however, redirects to 'ttraff.com', which is identified as a malicious redirector. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=destiny+activity+cypher
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/41682152456.pdf
    • https://cdn.shopify.com/s/files/1/0429/8076/9951/files/wopamifijen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2548/1379/files/ayesha_jalal_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/17827896921.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1298/files/epiphyseal_growth_plate_fractures.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcf30839bb4f44938fac5f89738432c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ae8e67454aa888573520db37d1a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_194942f9fdbf41b7bc0ed295b84cb7f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5cd7b02488f4d298ef00202ec2908f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d9c3d767978423cb507573b0db2f16b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f496e21c71f4133bbef8f40766c2897.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/maximum_number_of_overlapping_intervals.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/kuwubitikajapokovamape.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/linobojufenubusageral.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/81624182509.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_off00009821.bin
1b667b1149ef8ea7851e2db91ba2dfc61fdec877c81d756b2459709826566e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x9821 5152 bytes
font_01_sfnt_off0000a9ab.bin
87647055a778113e346d45dcdec8fe791567d511e3f8cc5ca88b1a54d508e284
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AB 10468 bytes