Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac9b7063a007342…

MALICIOUS

PDF

39.6 KB Created: 2020-08-18 23:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2897d07068677effdb1a1e352fe3707 SHA-1: 3ca4264ac35294effa43c016be16b3979c662b81 SHA-256: cac9b7063a00734270f9469d4d39abbc9edee595c0524aee0375850922c265ee
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with one heuristic specifically identifying it as a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=angular+6+formcontrolname+checkbox, is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains what appears to be a mix of legitimate-looking text and URLs, suggesting a lure or content stuffing technique. The primary attack pattern appears to be the distribution of numerous links, likely to manipulate search engine rankings or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=angular+6+formcontrolname+checkbox
    • http://lagojitit.kabloomgroup.com/uploads/1/3/1/1/131164250/62b7525.pdf
    • http://files.alekstinapoodles.com/uploads/1/3/0/7/130776519/4314976.pdf
    • http://tufutisij.okmulgee7.com/uploads/1/3/1/6/131606066/wepebiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3085/files/27724787877.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2412/files/53801238592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/vifakup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8673/files/girizatuwarivubaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/68948857255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/les_articles_definis_indefinis_et_partitifs_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/10512999391.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/cover_letter_graphic_designer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/certified_associate_in_project_management_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/5335804912.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/31502165310.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_off00005948.bin
dbd26f5edbe417629885c60821c4ab95cfe629548c1acfe91b22663d183c28a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5948 5532 bytes
font_01_sfnt_off00006bef.bin
91c3c6f2eb04fc056aeb2ef85ddf45704488b3f57e434ab9d7b8e5c3f799f377
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 11040 bytes