Malicious PDF — malware analysis report

Static analysis result for SHA-256 529e01c37ed19603…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 22:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6823a94228dc69774e55f097fecf7e SHA-1: 3be419b893aeed397c4496479700e44546babd8c SHA-256: 529e01c37ed1960358c0946fb1372906b58774e5aeb4e2342c1b20cbb1af012b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'class attendance sheet pdf'. This link, 'https://ttraff.com/pify?keyword=class+attendance+sheet+pdf', leads to known malicious infrastructure. The document also hosts a large number of SEO-optimized PDF links, many pointing to benign Shopify domains, but the primary malicious intent is the redirector. No scripts were extracted, and the document body is heavily obfuscated.

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=class+attendance+sheet+pdf
    • http://files.treefaeriefotos.com/uploads/1/3/1/0/131069987/tigakabisumodobu.pdf
    • http://files.elsafuria.com/uploads/1/3/2/7/132712154/7346977.pdf
    • http://files.canadianmedalofhonor.com/uploads/1/3/0/7/130776775/2570497.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/48134399942.pdf
    • https://cdn.shopify.com/s/files/1/0430/2438/4154/files/64023907724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38692385895.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/kimivipupivafuwarupubuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/troybilt_horse_tiller_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/xorizasiketesowapasurugas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/3d_plot_matplotlib.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/xazovadulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/ritenexisusurigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/panaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/29891942622.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/vabuzimedetebujoresa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0951/files/96506454209.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/nizisukuzeraned.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_off000069f7.bin
b4ef349056df37967bdb46be5ef61577a31b3ee22384f126e1f8a76cb866a15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F7 5052 bytes
font_01_sfnt_off00007b24.bin
7ec4bdb0a0677c8b9566d8a53952cb066b31517e68bd8cdbef0448e85a86894d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 10004 bytes

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