Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b2bb426b891164…

MALICIOUS

PDF

62.1 KB Created: 2020-08-11 20:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8677538fa4d7321007901b91e86189 SHA-1: 48d76db42307059eb510b7130a5f3ffeeb96c93e SHA-256: 43b2bb426b891164e0a9c0226a1c954a59ffcb335af07ad95837903f9e46a603
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.cc/pify?keyword=a+framework+for+integrated+risk+management+in+international+business+pdf, which is known to lead to malicious infrastructure. The document body text is heavily obfuscated and appears to be a lure for the embedded links.

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=a+framework+for+integrated+risk+management+in+international+business+pdf
    • http://files.goldnguntraders.net/uploads/1/3/2/8/132814476/tenidadikezesobo.pdf
    • http://files.kimrichards.co.uk/uploads/1/3/2/6/132695829/tegesoni.pdf
    • http://degap.masonmansungkang.com/uploads/1/3/0/8/130813604/cfa4e8819a179.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/jasuzojunonevuperofisalem.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/7054593858.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8629/files/byzantine_catholic_catechism.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/puduzala.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/niwopixozure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/converting_ecc_pem_to_pkcs12.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/hiperplasia_prostatica_benigna_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/8428/3033/files/92601123105.pdf
    • https://cdn.shopify.com/s/files/1/0431/8681/5139/files/gagodejumozunirirowifabop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/55307459410.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/john_deere_js36.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_off0000b581.bin
a0105edb2c33bfc7486f02001c6b9def53ae9d6fe39a83306a6b3eba4826f8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 5648 bytes
font_01_sfnt_off0000c8ad.bin
bb2765978d25fffcfec5cd4642adb7a5707e3ba972fa0f0a6223497ff6e29f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 10076 bytes