Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cfec92b1ec13f7…

MALICIOUS

PDF

63.8 KB Created: 2020-09-06 08:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f518b1560b6598d6aa4653703c4eb914 SHA-1: 94c6725f6d2ac68f89d191bdddd05f0824cea8ad SHA-256: 28cfec92b1ec13f7aa2771ec53dbe9a73c8c8948ab65c313a1c1ff2301810c01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/pify?keyword=converting+factored+form+to+standard+form+worksheet'. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, with the first being 'https://cdn.shopify.com/s/files/1/0429/4498/7292/files/74936693738.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise malicious content as a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=converting+factored+form+to+standard+form+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4498/7292/files/74936693738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/53892987580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/sample_cover_letter_format_for_job_application.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a107db_3e2d2f190ca94fd8a0e35fb12b7163bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d089b_ce98485d8a734a0989231d07320132ab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/84867541218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/bear_market_trading_strategies_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8721/7319/files/astm_a240_16a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d1d005_bfbcb0a3ac4a4b40a38ce7cc139990c4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d4579c_9c2914599bf04766b6a5b0ce9deb5c2b.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D0 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0000adcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCB 5432 bytes
SHA-256: 9c2bf6937cdb02165ce086baa65f35bb4db96a4e12dd21c83577aff14da21123
font_02_sfnt_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 10240 bytes
SHA-256: 9a5cb21dd934675570588bb5db5c14164117719413e79bda8765517843d6aa7a
font_03_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.