Malicious PDF — malware analysis report

Static analysis result for SHA-256 750b5ba5f98874f1…

MALICIOUS

PDF

44.7 KB Created: 2020-08-20 11:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 758ab40d1dfb38ba5543fe0261625d39 SHA-1: 2f3e3c56f2272880bc498fa78d27bea4fb209767 SHA-256: 750b5ba5f98874f134a4fc8636229c43422ead201ca8f79f76f4492b2442fd53
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/pify?keyword=sample+invoice+template+html, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to invoices and templates, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or engage in SEO manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=sample+invoice+template+html
    • http://files.rocykafotografie.nl/uploads/1/3/2/6/132696483/28baa19.pdf
    • http://files.sofiajagbrant.com/uploads/1/3/1/8/131856076/f5f1671979f5.pdf
    • http://files.ecolodge-laketiticaca.com/uploads/1/3/0/8/130814254/vovajas_nusefisut_tobenelaladute_dikudozubenigag.pdf
    • http://files.daviestreeservicesltd.co.uk/uploads/1/3/2/7/132741110/xijibam-gilonotetemutoz.pdf
    • http://kojer.naifamt.org/uploads/1/3/0/8/130874063/nokofejakos_dikuganolalir_gupuvafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5471/8358/files/55179819154.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/47666900423.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/wimube.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/1528016879.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/um_fernando_pessoa_agostinho_da_silva.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/subtitle_the_day_after_tomorrow_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/diwumibulejonirunivajupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/31825470539.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/zegusuvuwexabirimig.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/39739779510.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/kizazadeviraxopopizugekov.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/vawiliviveloxesetazig.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/43632344661.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071d6.bin
a7b73843fce2f08f25121b4a5321075f54e8c9abec0dbffe6f87353e04bd85ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 5060 bytes
font_01_sfnt_off000082ea.bin
ee2b58343227b25d90cefb54dad9f15ae1c1be08ea1adbbcf608b8976c155f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EA 10296 bytes

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