Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7adf63eb5e5ace…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 10:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11cf68292c830295eac19b8a4cdc0070 SHA-1: 82eb43041de5beb578657d5976cc232f9ec12eb6 SHA-256: fb7adf63eb5e5ace0cd9c8b4a71caccd4389c38a8bd355e1320fc991a4e9af82
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary malicious URL is 'https://ttraff.com/pify?keyword=beginner+dumbbell+workout+pdf', which is likely intended to lure the user into downloading further malware or phishing for credentials under the guise of a workout PDF.

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.com/pify?keyword=beginner+dumbbell+workout+pdf
    • http://vikonen.authorjtwilliams.com/uploads/1/3/1/6/131637257/8d0e845.pdf
    • http://files.healthcreation.net.au/uploads/1/3/0/7/130775032/rexega-kedum-milozoxifisid.pdf
    • http://files.northcentralkyahec.org/uploads/1/3/0/8/130814339/manudatukujov-vusozifavagaw-xegitigi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/ribugonobijufeken.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11411440246.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/jatasikenatexogagajogasev.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/gitudaborinabukozalanimar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/chacha_chaudhary_comics_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/sociology_optional_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80787326618.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/40572363612.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/63338420135.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/14779374677.pdf
    • https://cdn.shopify.com/s/files/1/0432/6293/5200/files/hemagglutination_inhibition_assay.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/40736753587.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/commercial_bank_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/uniden_dect_6._0_user_manual.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_off00006c5e.bin
605f465d8bfb0d7a20350143eaa742813a6db3f477c01c4f2cdd7a93d038f447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5E 5320 bytes
font_01_sfnt_off00007e75.bin
d3142ab3d11d02cc53ff1c1d1fa1eb4a4f6b3490b669941b67426e20a4ca4a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E75 10380 bytes

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