Malicious PDF — malware analysis report

Static analysis result for SHA-256 8174f420aa5374b7…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee837869a187f2b804d06f75e1446a3 SHA-1: 42ec24136f1a94d72875047a40175e74be2cc449 SHA-256: 8174f420aa5374b79bafe42a59538cbe918ef2eb6a41a929b5e15613000b273c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=hs+code+malaysia+pdf+2018+sst. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=hs+code+malaysia+pdf+2018+sst
    • http://files.brokeninkprinting.com/uploads/1/3/1/6/131607029/mirifogi.pdf
    • http://ziwema.filmstillphotography.com/uploads/1/3/1/6/131636648/6392254a1bcb1bc.pdf
    • http://nunovuxo.thelashlife.ca/uploads/1/3/0/7/130776407/xejaxajemudoj-bazidi-xutel-miniji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/75178070573.pdf
    • https://cdn.shopify.com/s/files/1/0434/1409/3986/files/docker_modify_image.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/oxford_dictionary_download_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/ketefasatesemisubulejeno.pdf
    • https://cdn.shopify.com/s/files/1/0439/4018/4232/files/english_alphabet_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/dojubaju.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/97360953397.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/celtx_storyboard.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6620/files/gijadadixaxumidemefijulud.pdf
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/87381542437.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/161080019.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000651b.bin
dc6d198c4f5fdd72809627d54367b193d1f11418e786f83dfe6faccfceac8c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x651B 5788 bytes
font_01_sfnt_off000078ce.bin
2bcecd3691957a8690e2d9789479eeca61f5cc183e02fbaa05e3bd9d8e151e32
pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 15636 bytes