Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7cb6d5713f9f91…

MALICIOUS

PDF

43.1 KB Created: 2020-08-23 15:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48a391a91dff3a0a3d6c83191953e8f SHA-1: ffa4577dcb26ef678c7c4816068500f0da5e397a SHA-256: 1d7cb6d5713f9f9168ba109d8db679bf659be233fb66dc6e5ca804b6e4d07080
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.cc/pify. The document body contains garbled text but also includes the same URLs found in the heuristics, suggesting a link farm or redirection scheme designed to lure users to potentially harmful 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.cc/pify?keyword=annealed+spring+steel+sheet
    • http://nunoliz.purposefulgrowthcoach.com/uploads/1/3/1/8/131857565/wosagamalera.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/diranokitipofelum.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/8034420331.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/85239606457.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/77856639153.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/64608971225.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/roblox_gun_script_exploit.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/arabian_nights_bangla_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/56053761754.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/degapesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/jibajulebute.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/assembly_line_balancing_problems.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_off00006a74.bin
34b6adf6ff54dbff8b10f97ab056f60045149c9d8635460b71e34f7d23995fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A74 5212 bytes
font_01_sfnt_off00007c20.bin
abc7a5817c217b0d92e41ba130d912f6667fc7dde170922e0153ac6a1e501615
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 10412 bytes