Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a491e0a53391845…

MALICIOUS

PDF

47.5 KB Created: 2020-08-08 15:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3edfeac5947c286534bd2fcca3292a SHA-1: ff8cbc08ec8a3482d4cf2ae96b6fdab84e942521 SHA-256: 5a491e0a53391845546c1dd60bf295fa0c752b0c1f2af4e7e0834b0d5ad32fe8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Christmas postcard template pdf' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of multiple PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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.ru/wb?keyword=christmas%20postcard%20template%20pdf
    • http://files.encounter247.com/uploads/1/3/0/8/130874326/7163799.pdf
    • http://files.paulennswiebe.com/uploads/1/3/1/1/131163601/jeripixowipo.pdf
    • http://files.churchbestpractices.org/uploads/1/3/1/4/131437085/zakepexur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/45602928675.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/pegufoxamufawiku.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/18131663527.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/mawewewaketajegediwuliz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/25668629805.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/77331431905.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/fogomiwivemisefegobeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/mozomosa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/alchemist_dota_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/48719978693.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/baseball_tee_drills.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_off00006ca8.bin
cee6450d087d01f14294f8551bd5ffdc031750a6b67c6aff5ead42e994bb2094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 5100 bytes
font_01_sfnt_off00007df9.bin
ba9477956c5569124f91ea8bc5ec531bd0731c3af98758337012418fee1716de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF9 10676 bytes
font_02_sfnt_off0000a28e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28E 4324 bytes

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