Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0b5cf98ce28053…

MALICIOUS

PDF

45.2 KB Created: 2020-08-12 04:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a897f747d3a3abf92a65436ff8c807 SHA-1: 6366bce7c05866ef9a57697df798bffa3b044d9e SHA-256: be0b5cf98ce2805375027bb49c1ec82195e2f3e1e190e7eae71ee2a0ad4ee723
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=1st+2nd+3rd+law+of+thermodynamics+pdf', is designed to redirect users to potentially harmful content. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier also 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.cc/pify?keyword=1st+2nd+3rd+law+of+thermodynamics+pdf
    • http://tizibi.learningforlittlepeoplepreschool.com/uploads/1/3/0/8/130874254/2aeff.pdf
    • http://files.caricaturesbymichaelangelo.com/uploads/1/3/2/6/132681150/8166191.pdf
    • http://files.ebbandflowadventures.org/uploads/1/3/1/4/131453615/gewajaremekafo_zitavu.pdf
    • http://files.campaign500.com/uploads/1/3/1/8/131856041/7293775.pdf
    • http://motajav.crypt0snews.com/uploads/1/3/0/7/130775085/3036fe9f125.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/42712878663.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1976/files/asterix_and_obelix_complete_collection.pdf
    • https://cdn.shopify.com/s/files/1/0429/4216/9244/files/fujojejojepipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/73336711088.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/public_ntp_servers_ip_address.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/wituronosukubebofolabomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4892/files/present_simple_present_continuous_and_past_tense_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/dslextreme._com_webmail.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/66913707508.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/nugogiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/download_plies_shawty.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/cash_drawer_balance_sheet.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_off00006521.bin
3c4407232eeba82774e011cfe5aacac24141136fa809df57bab6792aac148e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 5632 bytes
font_01_sfnt_off00007826.bin
896d05154c3b24910078654cf49386accd1d5ddef987a85a946ab50f820b999c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7826 9688 bytes
font_02_sfnt_off00009937.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9937 4324 bytes

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