Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa03dbd0fb92c1a…

MALICIOUS

PDF

51.7 KB Created: 2020-08-14 20:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc99f069e3d11c5200cf30fa1589663 SHA-1: 3bb3fbbc26da8e8e007d34608990d1b57e5f6aaa SHA-256: 0aa03dbd0fb92c1a782a4b8ee9a32204ecb6eb7e0fa9ae64efe6452943ec8bec
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This, combined with a high ML classifier score and a heuristic indicating a link farm, suggests the document is designed to redirect users to malicious sites. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pivot+table+over+multiple+sheets+excel+2010
    • http://files.loudonvilleumc.org/uploads/1/3/1/0/131070207/9d640ff4d339c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/www_myfbmc_com.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0664/files/25221448034.pdf
    • https://cdn.shopify.com/s/files/1/0435/8681/4109/files/deratovipereresafova.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/international_business_level_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/nevenokuzutifenom.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6083/files/85189358096.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/buvadekix.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/67793166143.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/bayesian_statistics_for_beginners_a_step_by_step_approach.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/american_airlines_logo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/29134395886.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/38050617020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/gadagaxeno.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/three_and_four_letter_words_in_english.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a0b.bin
ff943d7ee35f529ad030f3b07e8918d94073e3262cb7c196bef1a59933788272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 5768 bytes
font_01_sfnt_off00009d8e.bin
c2e02c091afa546e4497a37dff82df190491e77fde361c491c0abe03b7224ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8E 10756 bytes

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