Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aa708c48c439e5…

MALICIOUS

PDF

34.2 KB Created: 2020-08-24 13:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa68728c2eb77ccb13992a36ad4c6bb SHA-1: 4d4ca534616143dbd1aac456c52fd46827ce0afb SHA-256: e3aa708c48c439e54b538f026833263b2a006e464f6a61f3caf51ee1d72ed54e
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=weather+report+in+kolkata+bbc', indicating a lure to a potentially malicious site. The presence of numerous links, many hosted on cdn.shopify.com, suggests a link farm used to distribute malicious content. 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=weather+report+in+kolkata+bbc
    • http://files.electivese.nl/uploads/1/3/1/4/131437229/mavoxefemo.pdf
    • http://sawuxuke.giselabeckius.com/uploads/1/3/0/7/130775376/23e4af.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/65286306075.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/bojixor.pdf
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/gamogabile.pdf
    • https://cdn.shopify.com/s/files/1/0435/9510/4424/files/72797309580.pdf
    • https://cdn.shopify.com/s/files/1/0436/5929/6926/files/d_d_5e_actions_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0449/0782/3259/files/basic_electrical_engineering_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1710/files/technical_analysis_power_tools_for_active_investors.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/97723877816.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/minefibepurovib.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/reading_practice_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0438/4528/8093/files/islanders_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/sefepekekijunoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/93334024121.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_off00004aab.bin
3e73df731b36cf3082669332d7fe88f3e763b04e324b4cabe8d284f1b1081eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAB 5060 bytes
font_01_sfnt_off00005be5.bin
7f20e8c58906c47a944a6727c967d8208ac2660e0838ed397ca25df061bf0c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 9480 bytes