Malicious PDF — malware analysis report

Static analysis result for SHA-256 142bf1b82cc20191…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad136d89c6e026f77ae93e33b38460b9 SHA-1: 58d384e88148046dbafdfa2ff7ab15e18d5561fe SHA-256: 142bf1b82cc20191ac5348ecb132afc89f272d0586a60facabfa05b9e55b9690
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=heart+collage+template+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3267/2413/files/12066415290.pdf
    • https://cdn.shopify.com/s/files/1/0436/7548/4313/files/fuzufenejeturigote.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/coin_games_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6558/9414/files/vudaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/94383706698.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/fujemotawivozi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/dixalixonufatarodetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/87761095844.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/14143916219.pdf
    • https://static.usrfiles.com/ugd/b8c837_302454ce0cdf42f5b196069a7f5d608f.pdf
    • https://static.usrfiles.com/ugd/b8c837_27609062bb324a1bab5eda05fec4183c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d902eee5824e589dc911f1ba38adaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8382fce916485a95f9226344827507.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/guxugadowepetikukoxifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/vebelibabowonizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.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_off00006f9a.bin
c1bded1dc6f062ce562d1ad6cfd4de80df6d3854d1321688dfddbc3b75d06eea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9A 5120 bytes
font_01_sfnt_off000080f3.bin
55d34cb94433242b0990e55d11632a77a88e7b447a7e00daa52204ecadda2498
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F3 10408 bytes