Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a852493d78e0e79…

MALICIOUS

PDF

97.8 KB Created: 2020-08-09 03:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a81057af93ea4345bbfc4d966ba12d33 SHA-1: 50b7d1ff0dcfcc941ebcc681096b1f2c80cc9df9 SHA-256: 3a852493d78e0e79b2e98c938fdc69c94bb44c684bb917b331daa5ea1ec2c538
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the primary goal is to redirect the user to malicious infrastructure. No scripts were extracted, limiting the ability to determine further payload delivery or persistence mechanisms.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=pdf+of+multivariate+normal+distribution In PDF document text
    • http://files.rone.studio/uploads/1/3/1/3/131379266/gopijiwupevutekifari.pdfIn PDF document text
    • http://fifage.lmctotherescue.com/uploads/1/3/1/1/131163599/givozupimexejasatu.pdfIn PDF document text
    • http://fonesapi.whogivesascrapcolorado.com/uploads/1/3/1/3/131383664/7894999.pdfIn PDF document text
    • http://files.drtaoka.com/uploads/1/3/1/1/131164393/7087916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/the_antlered_ship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/air_conditioner_cycle_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/18852544513.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/calentadores_solares_caseros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/list_of_b_pharmacy_colleges_in_maharashtra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/rename_dataframe_column_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/bapajemumirire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/byte_to_string.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2881/4760/files/pokifodarigazanexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/advantages_and_disadvantages_of_direct_marketing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9301/7247/files/32069534527.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 5252 bytes
SHA-256: 9d10aef151b2d245a1775c8b4dc05aa3ebcd79088db8f2b7094dcdc1ebe3703a
font_01_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 17996 bytes
SHA-256: 7fe846e3b54cea8af55457e01755a2a6d71bc509693a96236d25879f08fc10aa
font_02_sfnt_off000161d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D8 16744 bytes
SHA-256: 9ff8a9de27d3f29295606172d5af35b85ccaa9c0a9212ad4ccb10132021197d3