Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a331889e054a94…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 00:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449c2f2979c618ea22492ac24b12a806 SHA-1: 78f1913ed637e3cb5a1079e032411fcddb9cc89f SHA-256: 71a331889e054a944b97eeac790c50d20fd3d97c18b1225fa256d609e3157778
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a malicious intent to direct users to potentially harmful content. The document body, though obfuscated, contains the malicious URL and references to firmware updates, suggesting a lure for phishing or malware download. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence point to a malicious document.

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=asus+router+rt-+ac68u+firmware
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/bodomobad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/nuniketesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/31281412344.pdf
    • https://cdn.shopify.com/s/files/1/0430/2975/8103/files/fixevugupodiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/sujuluxigidorajuzi.pdf
    • https://static.usrfiles.com/ugd/1c90dc_7961716b1947465282177857140ccde5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb9e44ca385e449696d4bb10c0f6fc92.pdf
    • https://static.usrfiles.com/ugd/ace02d_e36fc570eafe41bbb9a04daede6f561f.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd125f29738541e1989834b672fa047f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f73c7d0a84141f9b3453a32242d03eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bb6c7c4032f4a908242df1326e1584f.pdf
    • https://static.usrfiles.com/ugd/fac845_c1d4e6aacf9b44659ab0c310fdd50ea5.pdf
    • https://static.usrfiles.com/ugd/20d83a_fa40c7aa81374f5fa284e90e3a410850.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_off0000608f.bin
0c070545ae76527a3c3a32ca6dc6708ac629b844b6e9f2540b3a9a3a13b3bd57
pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 5456 bytes
font_01_sfnt_off0000731b.bin
409b9122e621f34881242debd9b20428921ac58767dca15b2f581241aba085fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 12380 bytes