Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f9f1a862320f4f…

MALICIOUS

PDF

74.6 KB Created: 2020-09-17 12:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d618bcc5737e59f9c89f22c5d5e151c SHA-1: 021990d301e3e8dc37196c266c1d51d67262fc58 SHA-256: 41f9f1a862320f4f6239975dda09cafd86c7ff6d43d8bdbaf58df8c39a815d37
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.me/wix?keyword=split-seq+vs+10x. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended destination. The presence of numerous other benign-looking Shopify links appears to be a tactic to disguise the malicious intent.

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.me/wix?keyword=split-seq+vs+10x
    • https://cdn.shopify.com/s/files/1/0435/5332/5224/files/enemigo_a_las_puertas_pelicula_compl.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/juwuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/zodid.pdf
    • https://cdn.shopify.com/s/files/1/0437/3315/6001/files/xosebororatabusow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2932/files/97487123314.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/79415803693.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7751/files/related_studies_about_english_language_proficiency.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/9411775525.pdf
    • https://cdn.shopify.com/s/files/1/0436/1833/6925/files/avian_influenza_in_poultry.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/96825060801.pdf
    • https://fdfb2e2d-8a58-4244-8ba7-0d41d7907ca8.filesusr.com/ugd/bb10c5_33c8f6426be84bd98f45df8e0f3ca42e.pdf?index=true
    • https://4901c93f-23f1-4476-98d9-d30c37803bb8.filesusr.com/ugd/a58b01_9ad74b87014d4e038e851641ff28d777.pdf?index=true
    • https://98feebe7-e21b-4358-bcc7-9150f27eb3d6.filesusr.com/ugd/0c8cc8_6f54fb6bb0134dc3ad3bb83d0793daf8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/jio_cinema_apk_for_sony_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0438/6422/8005/files/tactical_rpg_android_turn_based.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/87438295292.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin
e947b88b4324f202bda29e3a3236aeb0fc21c2a25cb278cb52de168b928434e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5088 bytes
font_01_sfnt_off0000e75e.bin
850b1d1d6d911cb08a85c1df525318362846e508edbd413b108537567e5686ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 17396 bytes

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