Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb135070f33bffb…

MALICIOUS

PDF

60.3 KB Created: 2020-08-16 11:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b9ee05e49f92da7cbd49ddc85e2d552 SHA-1: b83fd89abb8d4b6291dc4ba7e159d0d520088721 SHA-256: cfb135070f33bffbb2ecdddfea2bea4abc90d1c67a709130fdeec4d801aa8487
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link farm and a specific malicious redirector URL, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'worksheet answers' and the malicious URL, suggesting a lure. The primary malicious URL is https://ttraff.cc/pify?keyword=compound+sentences+and+complex+sentences+worksheet+answers, which is used to redirect the user. The PDF also contains numerous other links to PDFs hosted on Shopify, likely part of a link farm to improve SEO and distribute malicious content.

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=compound+sentences+and+complex+sentences+worksheet+answers
    • http://nubikut.smoothguide-internetfundamentals.com/uploads/1/3/0/7/130776445/miwezabedukonon.pdf
    • http://files.paintcakes4kids.com/uploads/1/3/1/8/131856636/tareju.pdf
    • http://files.nicholelreber.com/uploads/1/3/0/7/130776208/5933509.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/44969125570.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/7888842766.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/campus_recruitment_training_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6549/files/bible_nrsv_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4341/3407/files/domino_s_pizza_bahrain_menu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/adobe_converter_login.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/jenut.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0438/files/past_simple_exercises_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/77504191409.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/5954012879.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_off0000a2c7.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C7 2828 bytes
font_01_sfnt_off0000acc1.bin
d868c0ba5ffc489b94dfdb997ddca599a6081dd6d83b21960d2ff332a7d00b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC1 5440 bytes
font_02_sfnt_off0000bf22.bin
3651fa9fa412fcab96d1888510cab7bd35ac9593939c83253534fb0f7462edd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 9932 bytes

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