Malicious PDF — malware analysis report

Static analysis result for SHA-256 3673bd4e9165645c…

MALICIOUS

PDF

43.1 KB Created: 2020-07-25 12:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1d08d06b3be279960c8e78be450559 SHA-1: ea6358abde0e7ece83a5247a4dd8b40c4a6c21d8 SHA-256: 3673bd4e9165645c3eb903087007afc4cbe7dd027a5218a4edb8a3f6d332e5b5
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning model and heuristics indicating it contains a malicious redirector link and a link farm. The primary URL leads to a redirector, while numerous other links point to PDFs hosted on Shopify. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but does not provide direct clues to the user-facing lure. The overall pattern suggests an attempt to distribute or link to malicious content through a network of PDFs.

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=ghost+minimal+powerpoint+template+free
    • http://files.newartistfair.com/uploads/1/3/0/7/130776245/8647245.pdf
    • http://files.lawnritechichester.co.uk/uploads/1/3/1/0/131070207/movowubobosed.pdf
    • http://files.barefootcustomknives.com/uploads/1/3/2/8/132814624/bixajolafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/xefopobenepofezevizeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/kororuvix.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/sigefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/26367465187.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/minowekijigovolomajali.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/mugajalafusijew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/makobevife.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/filepugozitepuzaketinaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/gesemovizerejon.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/26532529821.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_off00006cb6.bin
cac810faa73da0302c976251d9c39db1d8cf94094688c17db1f1216dfe22f4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB6 5052 bytes
font_01_sfnt_off00007dc1.bin
a61a5ac8ae28c96a27bc6c40368b6bdbd6b18a1e8a6c07ed74a6da45ea6219b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC1 9824 bytes