Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1c1a558bdf3fe2…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 03:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d70edc90ff207a9054871d2e9f5dfab4 SHA-1: 9635c61dcf1561fa33d80688c654b1332c3e5a98 SHA-256: 7e1c1a558bdf3fe245166a39d9e4d2d58fd77cdf6114bdcd88f51ae7b4abcdc5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous external links suggests a link farm or redirection strategy to mask the ultimate malicious payload.

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=dibujos+con+operaciones+matematicas
    • https://cdn.shopify.com/s/files/1/0433/9990/5429/files/konogipowatokumotuzijub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/77218656562.pdf
    • https://cdn.shopify.com/s/files/1/0457/8705/4246/files/hogwarts_acceptance_letter_printable_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/criminal_psychology_book.pdf
    • https://static.usrfiles.com/ugd/07ef24_e9b24517110d4d83bd63ba743cf13095.pdf
    • https://static.usrfiles.com/ugd/b8c837_645c089ac308464b8c1b746283966581.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd1a8274c51f454a8fef573f351975b6.pdf
    • https://static.usrfiles.com/ugd/be19e1_b87717a211f3443eb8628bed3e5c84df.pdf
    • https://cdn.shopify.com/s/files/1/0430/8729/8714/files/ziloputewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/jopagegajurofimolor.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/20210413519.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/fawevapejosu.pdf
    • https://static.usrfiles.com/ugd/76156b_4d037a2c7cd14605b7683af8efbd4a74.pdf
    • https://static.usrfiles.com/ugd/6d59ab_b1275a2163f44626b01d4221a4c6f140.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_off00005cab.bin
3a857eac4b38a0f8d67a0ef020b73c099141dfcd268bc3e0c123f6da759f8650
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAB 5264 bytes
font_01_sfnt_off00006e67.bin
c5207d1b678b80c587af190040806866cf5ebc5a8437695802be41cd20e78390
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E67 10700 bytes