Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d06e282fa5ce89…

MALICIOUS

PDF

75.5 KB Created: 2020-08-24 06:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5cd7746ca73f78afd0f64728f876255 SHA-1: 72564492c8cfb28677382cf4f27f487b3b15df65 SHA-256: 87d06e282fa5ce896adc90b15b95516f86f3208f43bce474c5bc840f621fc728
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=ideal+gas+law+practice+worksheet+answer+key'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous external links, including one to a Shopify domain. The ML classifier strongly flagged this PDF as malicious.

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=ideal+gas+law+practice+worksheet+answer+key
    • http://files.yehyehs.com/uploads/1/3/0/9/130969185/ae9a6.pdf
    • http://jujurifa.wheights-sda.org/uploads/1/3/0/8/130813077/7714289.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/tudigizixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/digestive_system_of_human_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/81492050515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavijado.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/resource_aws_iam_role_terraform.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/fodlan_winds_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/25993609049.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/16376888304.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/var_root_._android_debug._keystore_permission_denied.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/farrah_abraham_back_door_superstar.pdf
    • https://cdn.shopify.com/s/files/1/0440/0024/7958/files/blockchain_programming_c.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 2828 bytes
font_01_sfnt_off0000e8cb.bin
8be4cef7e8d10f5b845d212a536648c2bee2b874c598e89803f1e5df55b2fb96
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 5532 bytes
font_02_sfnt_off0000fba0.bin
054ddb8873f8c4a50dc7edbbe8bb602048e43e54cceebb715bb3011b9f6f6858
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10192 bytes