Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a119b1a92fa723a…

MALICIOUS

PDF

53.2 KB Created: 2020-08-03 16:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3d2b1938ffb6858cc6609c52aac203 SHA-1: 518349cb15f1a4cb2642a0233af598ed77b7752f SHA-256: 5a119b1a92fa723a9fd522c1da6616adfad099a650c4424f381ee4ff10938a38
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a link to calligraphy exercises. The document body also contains numerous links to PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to harmful content.

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=calligraphy+exercises+for+beginners+pdf
    • http://files.tierrasantajuniorwomens.org/uploads/1/3/2/6/132695200/kamotazesun.pdf
    • http://files.icttg.com/uploads/1/3/0/8/130814205/7126333.pdf
    • http://files.addley2019.com/uploads/1/3/0/8/130874110/wafowalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/56922696792.pdf
    • https://cdn.shopify.com/s/files/1/0435/5542/2369/files/jaxojal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/60280739938.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5713/files/11428587788.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/37779434266.pdf
    • https://cdn.shopify.com/s/files/1/0434/6232/8472/files/27650251049.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/11965645648.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/xovobiwopesin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/macroeconomics_20th_edition_mcconnell_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/74036730410.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/kowafudumizifogexosov.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_off00006d9b.bin
9b2bc7000a51d0dd1f0afff3d08b5285340b8cbbb2471cdf440b80576ffeb1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9B 5460 bytes
font_01_sfnt_off00008024.bin
a5e96365e9fb6f2e05c9da516bf0328705b5d7583798589205cf8ceb262d84fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 10304 bytes
font_02_sfnt_off0000a397.bin
d4c4feb8951055c2fa9bcdd55af7a36c85e906000362d0091f30ac23a55c13ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA397 16192 bytes
font_03_sfnt_off0000b8cf.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 4324 bytes

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