Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d1b0e2d29cd127…

MALICIOUS

PDF

36.4 KB Created: 2020-08-27 16:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b58e8383f06a0e3f8cb095b8e842cd04 SHA-1: 62dca5a305457534ec6d1c0b86a50623a2e1e816 SHA-256: 62d1b0e2d29cd1279dcf2ff6f4953a3da97bc38224e5d1c30761ec4b3827ba7a
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary redirector URL, indicating a phishing or scam attempt disguised as a psychometric test manual. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the embedded URLs are the primary indicators of 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.com/pify?keyword=zavic+prueba+psicometrica+manual
    • http://files.publicschool121.org/uploads/1/3/1/3/131384436/761b0.pdf
    • http://sataxaru.alamedhirudotherapy.org/uploads/1/3/0/7/130740169/dewiwabekixepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2212/2151/files/rogororaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/dererusav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/7377642165.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/bowukerimupidujetepazomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/sifawusiwuledipulikisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/81750016880.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/51091546654.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9797/files/debivefewajopesaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/50402194838.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/vewelaxunawenoguzevew.pdf
    • https://cdn.shopify.com/s/files/1/0462/3617/2437/files/charter_club_sheets_on_sale.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_off00005096.bin
8663f5fe5464aec3a60fbcc454eed421611a7cdbb55be814337e8ecac28f58b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5096 5236 bytes
font_01_sfnt_off00006251.bin
785e506abfbe6889421f120baefba5cf4477a7215162a8cb642b38d097fee665
pdf-font-stream PDF embedded font (sfnt) at offset 0x6251 10176 bytes