Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db7fb18fc88a221…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 627f369b19c6d953891d5b7a6dbd8d0d SHA-1: d68086830fd6f18ae2d4cc9a1755674fc875752b SHA-256: 6db7fb18fc88a2216ccdf1618cb50bc0aef3499c55c410cad3f99429715b5cac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=daily+thanthi+epaper+cuddalore', which is flagged as malicious. The presence of a large number of links, many pointing to benign PDF files on Shopify, suggests a link farm tactic to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=daily+thanthi+epaper+cuddalore
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/barreras_de_la_comunicacion_psicologicas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/kerr_home_canning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/tamilrockers_2018_thiruttu_movies.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/programming_the_world_wide_web_sebesta.pdf
    • https://cdn.shopify.com/s/files/1/0434/2471/0807/files/93095468100.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/76273905625.pdf
    • https://static.usrfiles.com/ugd/b8c837_71f563edebbe41209750c9d1d639ab3c.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_c270ec44a015449fac169b18a9275df3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ec3383e45947c7bc008774b2a82d68.pdf
    • https://static.usrfiles.com/ugd/30e015_f50af6b6972740a5a2f28b7100a0ac69.pdf
    • https://static.usrfiles.com/ugd/e3325f_d65545f5cb2549d4bf3d7db07d19aa8c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/navy_seals_training_guide_mental_toughness.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/tunr_ai_to.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/pekitusebefav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/5_latitude_longitude_and_time_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/mekarumug.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000592e.bin
348661e98b6a5883c6c5e039e0b1bf88553af64dbe6525c389eec166fb5c241c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x592E 5084 bytes
font_01_sfnt_off00006a68.bin
3f539b985e6bf22c22b58e0ef57d21fbcf3dc0c0c75779cfa41a54d29041c26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 2952 bytes
font_02_sfnt_off00007665.bin
3ca03596ba1362780dd786975199de1d5a3ce714d3380f6a04f4592c8499308b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 9868 bytes

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