Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fc5875f9fff3e4…

MALICIOUS

PDF

53.5 KB Created: 2020-08-02 17:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae20995e0d26d9d5556082eacd26184 SHA-1: c5bea4e45a78fcaeb296c5a5f9a9a69a0f123ab0 SHA-256: 03fc5875f9fff3e428ca79ef439a84579dcbee39ded422a28a74e6c51ed2b4a5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, "https://ttraff.cc/pify?keyword=the+five+elements+of+effective+thinking+pdf", is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing a PDF document.

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=the+five+elements+of+effective+thinking+pdf
    • http://kafaxi.thefellowshipsite.org/uploads/1/3/0/7/130775219/pesog.pdf
    • http://files.moirajo.com/uploads/1/3/2/7/132710655/6052939.pdf
    • http://files.memoriescharcoalhouse.com/uploads/1/3/2/8/132815002/4055954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/zumoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5841/files/gitowom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/wijavukabopirige.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/tisuxirizenomuluzapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/mexorexezoponewefif.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/vosugedunimuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/todafowidudo.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_off000092f5.bin
d4dfcff20e22297e36bc5e115c19d90008192d5909b3d8ca3de4ea632551226e
pdf-font-stream PDF embedded font (sfnt) at offset 0x92F5 5336 bytes
font_01_sfnt_off0000a50e.bin
0dc085c70d9a1473d2072ca3ff49cafde8ed075ad98409a37477ad1451fdbb34
pdf-font-stream PDF embedded font (sfnt) at offset 0xA50E 10484 bytes