Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fd3341d1a57e15…

MALICIOUS

PDF

36.5 KB Created: 2020-08-25 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf2ad0e5b7539b32f22b70b6813f312 SHA-1: 9c23705b84958e681b6685feb7fe1010bbc65978 SHA-256: 42fd3341d1a57e15a635c0eed598d4bb8222d5110f54d84dfc84cc9edc2a83e1
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=kindle+previewer+software+free'. This URL is presented within the document body, disguised as a 'Kindle previewer software free' download. The PDF also contains a link farm heuristic, indicating a large number of external links, many hosted on cdn.shopify.com. The presence of a 'download button' heuristic further supports the lure. The primary malicious URL is the highest priority IOC.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kindle+previewer+software+free
    • http://files.thesavvywineshopper.com/uploads/1/3/0/7/130740458/sajinegawafefut.pdf
    • http://files.sophieknab.com/uploads/1/3/0/7/130739544/gedegigubaziku-bofoxo-pabevu.pdf
    • http://files.appliancepartscheap.com/uploads/1/3/1/8/131859895/juxewexozufo.pdf
    • http://files.cottageclockshop.com/uploads/1/3/0/9/130969761/ximisexonoxum-wegime-vapezezamu-legikufipizal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/79444471368.pdf
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/free_download_to_excel_converter_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/8449/7575/files/op_amp_ic_741.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/54338745979.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/print_handwriting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3030/files/zixonanesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/kapofujonumedevimebidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/tanagagixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/831440805.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/pemopunivakejud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/2082976754.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/kelavavumukoguvodawonape.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/gunajewodu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/wamube.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/
    • https://cdn.shopify.com/s/files/1/0431/5637/365

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005074.bin
7dd140d8a3da07d67596e2afb32b51f487e581a41fb91a5683948b015ebd1ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5074 5156 bytes
font_01_sfnt_off00006219.bin
a8cd77c9e3c34d343173fb487e4749ca44901647e482ab4f961f4fc3d5b7e65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 10420 bytes

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