Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31c4d9260e84b5…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 01:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c29b199e48740e97c6d4fa87c19492e6 SHA-1: c56e97b290234faafa589cabf92dcc71fecd6408 SHA-256: ef31c4d9260e84b56df9fca379bf03ce54dde5cd4d54731c17b4e6c115093227
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a textbook, which is a common lure for phishing or malware distribution. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=avancemos+level+3+textbook+pdf
    • http://pudivuza.haywardfitnessfanatics.com/uploads/1/3/0/7/130738836/nupabukesud-sipujijokaj-rarezuxowi-muvagigipu.pdf
    • http://wijize.cristalpgarcia.com/uploads/1/3/1/4/131453494/zitalog.pdf
    • http://gotuke.helene-steyl-art.com/uploads/1/3/1/4/131452922/jibububajusijisok.pdf
    • http://files.dogswelcomesouthdevon.co.uk/uploads/1/3/0/7/130775375/7652889.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/61067126792.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/tapuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/introduction_to_management_science_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8238/2502/files/positive_and_negative_effects_of_video_games_essay.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/arthashastra_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/reading_a_text_file_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5203/files/zuwejox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/asme_ansi_b16_standards_of_pipes_and_fittings.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/pusibawapezewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/22284972428.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_off00006b39.bin
9306d2a1079ae9a397b32af8dc0adb774341ee21d5c4135361d013645c6ee940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B39 5688 bytes
font_01_sfnt_off00007e82.bin
b2b440b4c2118c47898896bcf3050be0c590122914fa5fc7811be43aebb4a3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E82 9980 bytes

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