Malicious PDF — malware analysis report

Static analysis result for SHA-256 7611d5f855af4103…

MALICIOUS

PDF

43.2 KB Created: 2020-08-05 12:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31bd50a7257bd6758e5c6234b7d383cf SHA-1: 0225476489cc8955c46e7e2bffee8d07dec24857 SHA-256: 7611d5f855af4103c1ae0540348f70b9f1904c68fc1a59df31dd7da02d21967c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a free PDF download. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are part of this link farm, suggesting an attempt to drive traffic to malicious sites.

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=basta+de+historias+andres+oppenheimer+pdf+descargar+gratis
    • http://files.csoboston.com/uploads/1/3/1/4/131452824/4592.pdf
    • http://files.austinhighseniors.com/uploads/1/3/2/6/132681209/8363739.pdf
    • http://files.wargamer-painter.com/uploads/1/3/2/7/132740214/986c5a9a.pdf
    • http://files.technotronics.shop/uploads/1/3/1/4/131409498/035fd6c84d9b1.pdf
    • http://files.invisiblecrownblog.com/uploads/1/3/2/6/132695813/2cf33254e7eaf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48880371243.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/ragarebumufawexav.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/73655388815.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/vermont_renters_rebate.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/kutamuzitapenugonifap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/mufamuravanaxedawiwuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/5590791483.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/46440144901.pdf
    • https://cdn.shopify.com/s/files/1/0435/9304/0029/files/nunuzodawesaliwojiju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2629/files/logrolling_definition_ap_gov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0856/files/lejinil.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/woselomelatunedow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9623/4400/files/9239271419.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_off000065bd.bin
793921833ee2358813c22b91f77cf63513d383503250aa96cf26e5ddbd2ad120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BD 5588 bytes
font_01_sfnt_off00007897.bin
8861d40f7b64ca5578d0d9056e890048742a495c00a49fa5b75bbaf5eb2f2f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7897 11316 bytes

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