Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f3033a0c17435d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 03:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c227ab3fca8885ef42e11efdff334ad SHA-1: f807900832b4c45c0de687914e68b21e96b05893 SHA-256: 91f3033a0c17435d3b8ff6d88e9bf3dfdc40f7170a51f45934de36054a3b48aa
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded artifacts reveal a large number of external PDF links, many hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.com/wb?keyword=list%20of%20synonyms%20for%20grade%202%20pdf.

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/wb?keyword=list%20of%20synonyms%20for%20grade%202%20pdf
    • http://files.drpattymain.com/uploads/1/3/0/7/130738562/fugunalogufi_kijiritafuz_genapulewire.pdf
    • http://mifib.citruscountyaudubon.org/uploads/1/3/1/4/131483025/zolukud.pdf
    • http://files.gapcg.org/uploads/1/3/1/0/131070561/dogij.pdf
    • http://files.tomcottrelllandscapes.com/uploads/1/3/1/4/131409498/dujeforiv.pdf
    • http://telolog.caninesoncue.com/uploads/1/3/1/4/131453133/falogetorolofuk_fakename_towifoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/bujiwexuninijazelajetekud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/95338851543.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/34811168898.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/1302087087.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3013/files/12147608446.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6744/files/15892363792.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5846/files/verotogusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/las_vegas_serial_killer.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/78578994097.pdf
    • https://cdn.shopify.com/s/files/1/0431/3959/6454/files/73154910649.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/dadakanizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/activity_series_of_metals.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_off0000618c.bin
e5589041284f8ef9c2783ba4e795591faa1fe85adc3cf19b3ba63c2d065120b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618C 5504 bytes
font_01_sfnt_off0000742e.bin
8d7bdbe8b9187978f35dcae347c3ba994896001ffc28185838021f1d54341abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742E 9864 bytes

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