Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd743c38af89d09c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-06 01:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e19037f746a2770b71e884568a25232 SHA-1: 12ec7ef1128c880cbd742ea78d5a4c8fb2ab7d5d SHA-256: fd743c38af89d09ce41bf2a7aec3ed84f6a4de5b394c854127e1a229eaf891b6
150 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 external PDF files, creating a link farm. One of these links, https://ttraff.cc/pify?keyword=piano+books+for+child+beginners+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same malicious URL and benign-looking Shopify URLs, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=piano+books+for+child+beginners+pdf
    • http://files.futsoulacademy.com/uploads/1/3/0/8/130873783/woxadababakam.pdf
    • http://lerovuw.stevedurow.com/uploads/1/3/2/7/132712109/lakugejuwere_xataponud.pdf
    • http://difenobu.wherechangeiscertain.org/uploads/1/3/0/7/130776407/5746772.pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/cabinet_ministers_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1288/0544/files/8628371353.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/gikuvojoxajowurofojixamof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/magarelagosan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/dixebesif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/perl_hash_reference.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/9403796293.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/79324059627.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/24647513013.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/56050065951.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/rikakozatawofokamediro.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_off0000621c.bin
4a9587c1d689293ccc3cef4b096074b48a914cab3798559424163a49854c4ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0x621C 5328 bytes
font_01_sfnt_off0000741e.bin
5ff94693aced18e3948b0ca5ff3e74ac44565958eb428fc6dfd178db1e094c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x741E 10620 bytes
font_02_sfnt_off00009864.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9864 4324 bytes