Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2755c8f75ef4dfd…

MALICIOUS

PDF

50.6 KB Created: 2020-08-31 04:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45367b271e1411397349849b15c78ff SHA-1: 984675580944bafb6974906b03c1a1680dd7a55a SHA-256: c2755c8f75ef4dfd90c3e919b6f0d83b9907f85ccc3a12ca23c9c77b4333efb9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, also contains the same redirector URL and several other URLs pointing to Shopify, likely part of a link farm to improve SEO for malicious content. The primary malicious indicator is the redirector URL, which is designed to lead users to harmful sites.

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.cc/wix?keyword=city+skylines+map+editor
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/84848856883.pdf
    • https://cdn.shopify.com/s/files/1/0461/8348/1507/files/nedifati.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/domelefupegusamojof.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/present_continuous_tense_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/distributor_agreement_format_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0447/7432/6438/files/pdf_to_word_arabic_font.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/partnership_act_1932_bangladesh_in_bangla.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fea06ac913840e3b882f4a042104acb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a163b0170c94cfbb48ce232486b0802.pdf
    • https://static.usrfiles.com/ugd/b8c837_53822e562a8d44d19f61581a3675b8df.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbc5d4d42aef426d9b0325a200230972.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6250a253c848d9bf17ad1eedaefbd7.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/bomberman_old_game_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4903/files/fuxeroz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8655/1971/files/30590886898.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/sowapalidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007453.bin
f42047f250dc683c2db24d6879fe75194f0db07a16bec9bf0eb120667f575f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7453 5176 bytes
font_01_sfnt_off000085d5.bin
047126be52ac1fee988647d931920b2a2d6affa702c39b6e0290fd93ce39473c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D5 10036 bytes
font_02_sfnt_off0000a846.bin
caea212bfaaf2897f4851770f673d25c90b0e412378cb4b0d6f36fafa9739068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA846 16072 bytes

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