Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cd4095f4bfb824…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 13:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e833e6914060f51807a45673a6eb54bb SHA-1: 1ce715c34c66b3ba4b8ea402e7f629653bc7da7c SHA-256: d7cd4095f4bfb824bd9bccaa9c5e130dccc51c22a2e9545a5d0c84f9c0b83e3d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary redirector URL is https://ttraff.com/pify?keyword=research+journal+of+pharmaceutical+biological+and+chemical+sciences+pdf, which is designed to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a social engineering attack pattern.

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=research+journal+of+pharmaceutical+biological+and+chemical+sciences+pdf
    • http://files.easyorchidgrowing.com/uploads/1/3/1/4/131483830/jivifupuf_jirosasasob_xoreregosisen_bulezuvuro.pdf
    • http://files.mrsmuenks.com/uploads/1/3/0/8/130814106/8189373.pdf
    • http://files.yarmouthportlibrary.org/uploads/1/3/1/4/131482853/xemarenulavilus-tadutisosame.pdf
    • http://files.apply-me.com/uploads/1/3/0/8/130814172/kokitero.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/ropubifexisemojamuwatiwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/19144329599.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7445/files/lujowitowilipidibivodur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/78650841932.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/86404716134.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/bewetaxuwilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/australian_animals_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/danebosuvebewodebesupag.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/viwaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/fuvojowulipetaxomimuxu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1131/5611/files/bsc_magazine_jan_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/35660702955.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/amitav_ghosh_the_shadow_lines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a46.bin
f8e8f35dc386ae4f97797c5c09a9e4afdf329c284fbfe9ae547c11c353aa1b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A46 5676 bytes
font_01_sfnt_off00006d5f.bin
6d46048f2e3f8f63d076a1bf7b1ca9dc55ccf45b37a02bcb7f43733f9524d210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5F 10148 bytes
font_02_sfnt_off0000900d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900D 4324 bytes

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