Malicious PDF — malware analysis report

Static analysis result for SHA-256 140c92b4fe9312ae…

MALICIOUS

PDF

45.0 KB Created: 2020-09-03 14:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ee8d39d6b9d7a1f310d8a6de1eb30bf SHA-1: d087e18bad41c942aa9942003f0ee6a36c42d23c SHA-256: 140c92b4fe9312aef33ad8e4824c878f64dd81015f510da058ba3ae4e07d53ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which is a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for "logical operators in c language pdf", directing users to the malicious URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.me/wix?keyword=logical+operators+in+c+language+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/3534/4287/files/mon_ket_stream.pdf
    • https://cdn.shopify.com/s/files/1/0451/7868/3541/files/budapest_guida_turistica.pdf
    • https://cdn.shopify.com/s/files/1/0433/5825/7306/files/95353650197.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/metro_map_download_2020.pdf
    • https://static.usrfiles.com/ugd/92ee2b_64ac2283459c4c8db641ce21e773562c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8298f1fa6bdb441c93f0ece271c65248.pdf
    • https://static.usrfiles.com/ugd/0d089b_46df82d22f1347c7a4b20479773ab9bc.pdf
    • https://static.usrfiles.com/ugd/696b8a_08bf2cbfe9c947c38e950160b6797193.pdf
    • https://static.usrfiles.com/ugd/35dc59_34f67b5f0c6749c9881c2c031fbcfd3a.pdf
    • https://static.usrfiles.com/ugd/70094d_4839eea04e2246e090ab903b68ece18f.pdf
    • https://static.usrfiles.com/ugd/8ab72e_32e765e967e440b791358d2b89a8070f.pdf
    • https://static.usrfiles.com/ugd/dd4472_fba6860dcdce417192823d56dc132eb8.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/75329171132.pdf
    • https://cdn.shopify.com/s/files/1/0437/1513/3605/files/sekoxusipitukovedibozage.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7779/files/answering_machine_green_velvet.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000673d.bin
ccf16b9a60203d25379029b3e1cc1186d77dd9c84e5cd630a00f87f878b61f63
pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 5264 bytes
font_01_sfnt_off0000793a.bin
775f417c0eaad7e88a786033e6ed8b3d7e12c39c86d02571d4ad45bfcc241c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x793A 14716 bytes