Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f937dd87dc1ebfd…

MALICIOUS

PDF

35.7 KB Created: 2020-08-21 00:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f34eaedc3fa9ca0352004a6841af25eb SHA-1: 7d023ec484e5fce879243064358524de1b5a7b85 SHA-256: 9f937dd87dc1ebfd80c1b7a8e51716b8630e50cf8cf7a48ae025af3ea9d4cea5
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, https://ttraff.cc/pify?keyword=norton+antivirus+apk+uptodown, which is designed to lure users into downloading potentially malicious software. The document body, though partially corrupted, contains references to 'Norton antivirus apk uptodown', reinforcing the lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier 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=norton+antivirus+apk+uptodown
    • http://files.undefeatedcourage.org/uploads/1/3/0/8/130874554/8652281.pdf
    • http://vomapaxa.roxannesmith.ca/uploads/1/3/2/7/132740214/mujefedeko.pdf
    • http://zunejaw.precisiondental-nj.com/uploads/1/3/0/7/130775111/sizap_larenodenab_wiwobab_zawanebawitek.pdf
    • http://files.parkavenuetutors.com/uploads/1/3/1/6/131637656/lajol_zuwafafoduwo_zufudoveno.pdf
    • https://cdn.shopify.com/s/files/1/0440/1761/4998/files/32285556804.pdf
    • https://cdn.shopify.com/s/files/1/0462/2401/5514/files/48850900818.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/68315759586.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/mco_5530._14_a.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/43175453322.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/somisowipulutinuxop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/63187938601.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/experimental_research_articles_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/17063473259.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/disadvantages_of_computerized_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/bulletin_d_information_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/24876667330.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_off00004855.bin
2d57e2a5c46ddb1229f331df70447674f716688ea8b7ef39515a523bf85c23e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4855 5108 bytes
font_01_sfnt_off000059dd.bin
601707ff9b02c7dc616f95bdaa2c135e4918a6c618ea248c78d2ac58f7a782bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DD 12612 bytes

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