Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3ab8f7ff3e7765…

MALICIOUS

PDF

59.1 KB Created: 2020-07-28 15:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d561edc15ad35187c31f1967c812e28 SHA-1: 70ebb15384159faaa20a95d882c6174cd0ee33b8 SHA-256: fe3ab8f7ff3e77650904c7e73f3e3fdf0a9f2b8304527f5780c78d8fdd44d112
120 Risk Score

Malware Insights

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

The PDF file contains a deceptive document body referencing 'Chamsys show file' to trick users into clicking embedded links. Analysis reveals a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating that one of the embedded URLs, specifically 'https://ttraff.com/pify?keyword=chamsys+show+file', leads to known malicious redirector infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, with 'https://cdn.shopify.com/s/files/1/0432/8144/9126/files/xolotatokekunerenufum.pdf' being the first identified in this farm. The file's purpose is to drive traffic to malicious sites through social engineering.

Heuristics 3

  • 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.
  • 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=chamsys+show+file
    • http://files.heavygrail.net/uploads/1/3/1/3/131380733/bitat.pdf
    • http://files.nick-paul-dive.com/uploads/1/3/0/8/130873923/3243546.pdf
    • http://files.portlandmainemassage.net/uploads/1/3/1/8/131856995/lixajidavigamo-wutereta-zurepejobelur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/xolotatokekunerenufum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/78609210824.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/43831372653.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/zozivefovala.pdf
    • https://cdn.shopify.com/s/files/1/0439/4080/6824/files/wubowoturagelosonazejuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/62774484245.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/meripomovegutosanufawije.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/74380002237.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/44787536445.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/55608606623.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/nidix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9993/1295/files/tipenesupibuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/miwumavonurorusu.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_off0000a515.bin
b19b62a2f600d98b1c16e0c34d7ac40741a31b49ad5d8557a37122ebe315c6da
pdf-font-stream PDF embedded font (sfnt) at offset 0xA515 4732 bytes
font_01_sfnt_off0000b548.bin
62d46b8ad6ebb057852ddd64a6faf8ce491a5f5943fcdac44a099e69e64ecd4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 12908 bytes