Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7c90879a1cbf30…

MALICIOUS

PDF

42.4 KB Created: 2020-08-15 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c4c40166d1ce68ab0e44e05b1dd30f SHA-1: abb98ae5702f02474c8519283b87cacb850705f9 SHA-256: 9d7c90879a1cbf309aee121139c41cd9fd9eb16f8960be8542647e1b2286d5a7
120 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 what appears to be a link farm designed to drive traffic to a malicious redirector. The document body, though heavily obfuscated, contains text related to 'usmle step 1 first aid 2019 pdf free download' and a URL that matches the redirector link found in the heuristics. This suggests a phishing or scam attempt to lure users to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=usmle%20step%201%20first%20aid%202019%20pdf%20free%20download
    • http://files.mindwarehouseconnect.com/uploads/1/3/1/3/131383791/dabebafujavarobi.pdf
    • http://files.lasvegascharactervisits.com/uploads/1/3/1/6/131607075/levaxikolixana-reveguvezeleweb-wujiso.pdf
    • http://lududokar.vaalrivercitymarathon.com/uploads/1/3/0/9/130968973/nujufubonatilo.pdf
    • http://files.storyshack.org/uploads/1/3/2/6/132682790/sofepasatumokozikiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/bavaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/lateral_epicondylitis_patient.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/albion_online_beginners_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/leberefubamokuvirowejiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/series_6_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/castells_communication_power.pdf
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/85728413570.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/53023691475.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/14705153709.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d41.bin
c6ec846be07358ee37ce1e9cb0f964e15d139d1e4e5845fa23174c3f25828407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 5752 bytes
font_01_sfnt_off000070ce.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CE 1800 bytes
font_02_sfnt_off0000795c.bin
09d63260f2ccc7334b2879c9f8c514c07ce8fc65008dc2900554ce27fbcec869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795C 10224 bytes

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