Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e8efe967b41ae3…

MALICIOUS

PDF

34.7 KB Created: 2020-08-10 01:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c195d6501550d042eca9d6833f8b426 SHA-1: 90a252a5fad67bcea5d3c217332967b006bcb9a7 SHA-256: b2e8efe967b41ae31fab51fe96a3e563dec6d18134fdfb4a69a886976c988b5d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=carol+of+the+bells+choral+sheet+music+pdf`. This link is presented within the document body, suggesting a social engineering lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=carol+of+the+bells+choral+sheet+music+pdf
    • http://sugewefo.potlatchfundcohorts.org/uploads/1/3/1/4/131482995/317d517c32a4752.pdf
    • http://files.belleandboy.com/uploads/1/3/1/4/131437322/widurumuserolobobawe.pdf
    • http://tisuvujum.andre601.com/uploads/1/3/2/8/132815028/8685829.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/10991834438.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/lezaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/rejikawoninexaba.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/xukugodanofubaxemirugemol.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/5380578437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55497749658.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/gijitinizes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/30305620510.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/palofafij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/contact_form_7_bootstrap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/luwokox.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d8.bin
ab425d54d28172f8261626cce3de6efe5c67480808f2903d531a8190879074ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D8 5440 bytes
font_01_sfnt_off00005b26.bin
bf36bdb3814f5815ede8b7dba1f2ad6e0a52f986222cc8c318012a7b63742ff1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B26 10176 bytes