Malicious PDF — malware analysis report

Static analysis result for SHA-256 77da5ad929d2a3b9…

MALICIOUS

PDF

46.5 KB Created: 2020-08-04 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ca64aef20a6a045b8d042fc046d55a SHA-1: 286e10156edb6e9d4ba5ac2e13e60648eb8b2ae6 SHA-256: 77da5ad929d2a3b995257498f140963d7e245c9eb2dd411fe95947d861c9ad43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.com/pify?keyword=barium+chloride+dihydrate+msds+pdf, which is likely used to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious 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.com/pify?keyword=barium+chloride+dihydrate+msds+pdf
    • http://files.yardstickgolf.com/uploads/1/3/0/9/130969974/vimotodiwupela_lijitokorunoja.pdf
    • http://files.haskettconsults.com/uploads/1/3/1/0/131069950/tanuzu.pdf
    • http://files.sophiaeportfolio.com/uploads/1/3/1/1/131164402/9986e74979b2b9.pdf
    • http://files.meaningsoftheheartart.com/uploads/1/3/1/3/131383924/4349611.pdf
    • http://files.sukooncoffeeicecream.com/uploads/1/3/1/1/131163712/9101654.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/81400204181.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/25875072874.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/40270241001.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/losiselipatokesaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6598/0581/files/popirepizasewosibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/kitewubijezevesukuvudiroz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2650/files/sawuxakudum.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8538/files/75591719292.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/79729363222.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/parideraxomiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/minecraft_forums_shaders.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/80650748765.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/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006731.bin
c65635fe90107a13ff07178a0cbf6f84e8e915398ebeccc8c5394cbb9dc02be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 5544 bytes
font_01_sfnt_off000079e1.bin
0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E1 6148 bytes
font_02_sfnt_off000089c1.bin
c3a18768d7c6f5c8c7408e8b5d7f6eebfcdb7cb87c00d871f3398e7e661b4ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C1 10184 bytes

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