Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e95e5368d3b448…

MALICIOUS

PDF

51.0 KB Created: 2020-08-21 03:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a71deae265548e707c5c241c86ccff8a SHA-1: 357e4cd36d0bc70e61c10e11986e2234337a8830 SHA-256: a3e95e5368d3b448ed26288a9096c9a8937fbb65e97a01fecbe9ae39293de649
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=bubbleupnp+server+apk'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the target URL and a reference to 'bubbleupnp server apk', suggesting a lure for a potentially unwanted download. The ML classifier also strongly flagged this PDF as malicious.

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=bubbleupnp+server+apk
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdf
    • http://giwodevi.whittonprecision.com/uploads/1/3/1/4/131437064/832b13.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/sexekosibapovivafoxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/chloroform_spray_use.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/42666077046.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/muweliweketajomizutakaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/achievement_motivation.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/b._ed_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/exercices_algorithme_les_boucles.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/cbspd_gi_scope_study_guide_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/proving_parallel_lines_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6921/files/fepivagojelikefotate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/44973690678.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/27118814056.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de1.bin
d727d863ce302fcae483857ca613f673e545e3ee9aaba58ab006e7d3db2de313
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 5128 bytes
font_01_sfnt_off00006f56.bin
bf494fae0aebb2049b3b703fd93192e14669f81cece4ae72ca4a3ffeea41cdcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 6396 bytes
font_02_sfnt_off000085ca.bin
8d85a6528e615eb9fa4d6b8e0112c23a584b0cab975790a1328b238be8acbe03
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CA 10436 bytes
font_03_sfnt_off0000a9a3.bin
371f4f5486839d6f666b63f4bc691dfaed9719b7755953d003289165be206b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A3 16148 bytes