Malicious PDF — malware analysis report

Static analysis result for SHA-256 a519397049fa611f…

MALICIOUS

PDF

43.6 KB Created: 2020-09-09 04:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c97d01b3c7586550786b18a2624f4bc SHA-1: d9bc5a11bbf16efd6038b5f8d3d6f55ed9893a50 SHA-256: a519397049fa611ff63b6b68f67c09ee5877ddd2fd5ca0edf536620d4497b13d
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for Android Marshmallow. The link, https://ttraff.me/pify?keyword=android+6.+0+marshmallow+l%25C3%25A0+g%25C3%25AC, leads to known malicious infrastructure. Additionally, the PDF contains a large number of links to other PDFs hosted on shopify.com, likely for SEO manipulation or to appear more legitimate. No scripts were extracted, but the presence of a malicious redirector and the lure in the document body strongly suggest a phishing or redirection attack.

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.me/pify?keyword=android+6.+0+marshmallow+l%25C3%25A0+g%25C3%25AC
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/mastering_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/concepto_de_auditoria_administrativa_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/vasemefusijupado.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/00325-_95800-_00000-_aaoem.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/89824246241.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdac5216c419411fbf86e9ccc374eabb.pdf
    • https://static.usrfiles.com/ugd/63f22d_bfa7775e50f141bca26125200bb907dc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/banana_tree_menu.pdf
    • https://cdn.shopify.com/s/files/1/0461/9026/4478/files/download_inuyasha_episode_terakhir_sub_indo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/58639785815.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/mawisidiwenudaxop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3971/8552/files/robedegini.pdf
    • https://static.usrfiles.com/ugd/b2ba6b_b983685ee25d4f73a218d994412ecd0c.pdf
    • https://static.usrfiles.com/ugd/1d64af_3647606c309842fdb0bca5316cbb45e7.pdf
    • https://static.usrfiles.com/ugd/097bd5_404b63be900b47ccb0ea54c398b504c6.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_off00006873.bin
d141b1783b761674575f284c56dfe7cd8e0c38a5542398002edc8d76db50fdc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 5936 bytes
font_01_sfnt_off00007c04.bin
ee9bc127f8ddc66d1d8948d4b9258a38f07b73c8b6ec2ebcb3b93ca4a9e8e908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C04 10492 bytes

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