Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d5501021db55e7…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 05:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea97e993cab9271f61bab69f70acd59 SHA-1: 3837a43065879aa388802936190dab2fb9dd8c5f SHA-256: 41d5501021db55e747c569efaf365c7d77a50dc176d2c63c51d63e5f6bd6e953
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a timesheet calculator. The document body also contains this URL, reinforcing the lure. Additionally, the PDF includes a large number of links to other PDFs hosted on Shopify, likely part of a link farm to improve SEO for malicious content. 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.com/pify?keyword=timesheet+calculator+with+breaks
    • http://files.shellbackcustoms.com/uploads/1/3/1/3/131397940/d6f2a990a29ad9e.pdf
    • http://files.homecade.com/uploads/1/3/1/1/131163667/fujavuposukomo-nofubax-mojemalup.pdf
    • http://dagosa.lhsdramaclub.com/uploads/1/3/1/8/131871433/1773507.pdf
    • http://mifarofed.reederschurch.org/uploads/1/3/1/0/131070450/lukiro-sabokubujori-koxuxosise-vekomejedawa.pdf
    • http://files.imogendickie.net/uploads/1/3/0/7/130776265/mamefidu.pdf
    • https://cdn.shopify.com/s/files/1/0441/2227/5992/files/austria_guide_eu4.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/difudafidusebazul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0579/files/47266879858.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4411/files/print_no_newline_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/sokevufejapogibupazodimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/lawufatavaresi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/open_inbound_delivery_report_sap.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/wusutamaburenosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/como_criar_uma_assinatura_digital_em.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_off0000624e.bin
2ae6a2fc250f79fb09047a3d3506ba7f98b03fe816240066d7d1e6c6e853bddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5284 bytes
font_01_sfnt_off0000742c.bin
b60439f2758c63cb2d11106c1470c8c31a168d65aab44863291b5ad46c2fe0f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 15048 bytes