Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5cae121e267f3c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 22:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14e0d43a6d472a9d2dc6f90228435ff SHA-1: 7805ac66cb39a93ffb08de20c23cff08e83d1900 SHA-256: da5cae121e267f3c6e9e6e05adcdea03b185632466269673f35ef6fab823c756
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, and the PDF structure itself is the delivery mechanism.

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.com/pify?keyword=metabolismo+de+los+aines+pdf
    • http://files.elrinteriors.com/uploads/1/3/0/9/130969231/tejamuroro.pdf
    • http://files.teshtalk.com/uploads/1/3/2/6/132695569/6088650.pdf
    • http://files.store.wssbadminton.com/uploads/1/3/0/8/130814666/6057121.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fatisakiramoborilit.pdf
    • https://cdn.shopify.com/s/files/1/0436/5638/0574/files/yify_tv_shows.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/laritovoneruxavarup.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/sekaledupuvesazisefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/vafifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/66811387170.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/how_to_be_a_better_public_speaker.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/27795825798.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/56183279274.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/jajoniweridoralubukisij.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_off000070f4.bin
2a89a50e7a2aa171ada43773367917b1e6176a8dd2fdcee759a983237ed229a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 5236 bytes
font_01_sfnt_off000082b2.bin
d666722858102c61178811a07a92cfe5bb7da65912dbdd143fc6bcf3e8104484
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B2 11600 bytes