Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9c4bd198614f3f…

MALICIOUS

PDF

47.1 KB Created: 2020-08-23 04:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf33f5bdd7b2816bdcd3afbf015b6bda SHA-1: 21a72ee23df4b2f4ae18ec480359de9da0c9b83d SHA-256: ef9c4bd198614f3f7b27921546e53bebecc0ca50286be9d9d50f0fe46b2b2da4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.ru/pify?keyword=calzada+romana+cercedilla+informacion', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to PDF files hosted on Shopify and other domains, suggesting a campaign focused on link manipulation or redirecting users to malicious content.

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.ru/pify?keyword=calzada+romana+cercedilla+informacion
    • http://madav.pfoa.com/uploads/1/3/2/6/132680813/kixejuvif_sevoke_sakape.pdf
    • http://files.artsongsheetmusic.com/uploads/1/3/2/6/132681356/18b7897321.pdf
    • http://wolive.pigandink.com/uploads/1/3/2/7/132712324/womirekipoxo_vufizuzari_jawewasif_fivetika.pdf
    • http://files.backyardboyslandscaping.com/uploads/1/3/2/6/132682327/jabifef.pdf
    • http://files.ibyouth.org.uk/uploads/1/3/0/7/130740323/8efd21538.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/viwuzeduludinipuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/vavizabogexitofepopele.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/non_alcoholic_cocktails_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/56467798647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6909/files/58575278243.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/66375929801.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/greater_magic_wand_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/kufilip.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_off00007798.bin
6b59ed82bcdc83cea3c46a82d828bf86d4880f8e8b4bd973b60c7070a840b9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7798 4944 bytes
font_01_sfnt_off00008853.bin
4a24cf3f1b05165bcff0e31e6559fbc9e8dd00839cbb1179a9041fa66b6db2da
pdf-font-stream PDF embedded font (sfnt) at offset 0x8853 11372 bytes