Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5f2c2ba8fe3c61…

MALICIOUS

PDF

47.8 KB Created: 2020-08-16 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af2e27a71c952e49002d59293ba215c6 SHA-1: 7f0616017a42b652abdf6d89188d4145f13fc834 SHA-256: 5b5f2c2ba8fe3c61d3afcf148a265a970bbac1b55d1dcf841c2629b36999dc67
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes text related to 'dictating letters and reports' and a URL that is also flagged as a malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, further supporting a malicious intent.

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/pify?keyword=dictating+letters+and+reports
    • http://mufafok.whitlinghamcharitabletrust.com/uploads/1/3/2/7/132740214/pelewunagerori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/puntos_maestros_de_auriculoterapia.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/accounting_for_dummies_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/bezoxafuwuvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/after_you_ve_gone_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/25507867551.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/sedalapoxijes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6437/8022/files/boyer_moore_algorithm_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/jurnal_metabolisme_lemak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/porebefo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/43441618675.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/nuzosasoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007255.bin
5de9550ea79a61107cd160a7aa737cf7d1ef789c21a5ab581d52665c9babfdb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7255 5028 bytes
font_01_sfnt_off0000836f.bin
4148828b47ff8484cee4ae6d2bf828375b94f1d49190431c51a5b361e26e2587
pdf-font-stream PDF embedded font (sfnt) at offset 0x836F 9704 bytes
font_02_sfnt_off0000a466.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xA466 4324 bytes