Malicious PDF — malware analysis report

Static analysis result for SHA-256 7483d0e8a258d6a2…

MALICIOUS

PDF

53.7 KB Created: 2020-07-25 14:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b7e41184ba9356e3eb91bd91598fe07 SHA-1: 1020c25bbc7c1ec20b0353d5d7ce536be0a5c251 SHA-256: 7483d0e8a258d6a2c7322c293a0b8120bc5944ddaf65623fb175814ebd091bc6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to external sites, potentially for phishing or malware distribution.

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.ru/pify?keyword=castelli%2527+s+virgin+widow+pdf
    • http://files.donmelnychuk.com/uploads/1/3/1/3/131381066/aad9a75d83.pdf
    • http://files.jerryjonesguitars.com/uploads/1/3/2/6/132681436/fapixumiwezewip_zuvetuwigapikim.pdf
    • http://files.sweatyeyeballs.com/uploads/1/3/1/0/131069819/paluvobubebabexowu.pdf
    • http://files.srimayogaschool.com.au/uploads/1/3/1/8/131856195/647294c5a543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/16626867559.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7113/files/80364962170.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/gatopusuluxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7875/4199/files/80506467954.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/75044316403.pdf
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/ximamanodimisik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wimuwukewamofese.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/10144136870.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/38207540285.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/bezodapopukunem.pdf
    • https://cdn.shopify.com/s/files/1/0434/9027/9574/files/tawekuzalexisajanerawe.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_off00009717.bin
b05da83c7249396c025432d55c13b8d71146d8f48c87166292deb2e24621d682
pdf-font-stream PDF embedded font (sfnt) at offset 0x9717 5204 bytes
font_01_sfnt_off0000a8f6.bin
5bcd95607e2e7abdb42b9adb1a851c234828f2562aeda61db5f689b1e3f605d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F6 9664 bytes