Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaea25aa21c32b56…

MALICIOUS

PDF

33.0 KB Created: 2020-09-10 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c817a02828db48cbef0e5d30b008f3f2 SHA-1: ca8709e2ecfe9aad4dca9308602556b2e4cfc6ba SHA-256: eaea25aa21c32b5617fc6db35502eac7e39ab70265563167d7552d970ca513e5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, https://ttraff.club/wix?keyword=fortnite+bingo+sheet+season+8+generator, points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier 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.club/wix?keyword=fortnite+bingo+sheet+season+8+generator
    • https://static.usrfiles.com/ugd/54fa57_7a14bfcc54bf450f874de7d821bb30f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e261fc6a85604b87890c33fb52107b63.pdf
    • https://static.usrfiles.com/ugd/7041e4_93119b2959754b98808832c13aa12161.pdf
    • https://cdn.shopify.com/s/files/1/0463/0249/4877/files/character_examples_ncoer_support_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/gukibumirugijiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/82085404749.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/biwufiwupol.pdf
    • https://static.usrfiles.com/ugd/1e533a_e19ffa3b533a4b7794d5b872e9871741.pdf
    • https://static.usrfiles.com/ugd/fe0276_c78427f8db1041da94ad81a8ab65e085.pdf
    • https://static.usrfiles.com/ugd/8ade13_4a0e252f0dee4c10bdb6d3d5f0968507.pdf
    • https://static.usrfiles.com/ugd/0e6328_ffa843592da94e788a638bf11d9b78ba.pdf
    • https://cdn.shopify.com/s/files/1/0436/3668/7008/files/network_security_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/pujimofejasakifulomokuzes.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_off00004603.bin
15d06d27b40018b1036d49bf9467825f6e11ad4fe469cf1c2949eb4927b641eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4603 5204 bytes
font_01_sfnt_off000057b2.bin
887e3c8a4b90639238e09959af6100314e92338516e43062e371e5eba1055e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x57B2 9232 bytes