Malicious PDF — malware analysis report

Static analysis result for SHA-256 498775d5c21e4988…

MALICIOUS

PDF

52.7 KB Created: 2020-08-09 06:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fc6be94b73f648ed78de8e755b78b01 SHA-1: 615fa8717241c976693bb73b2b5ac7021e041a71 SHA-256: 498775d5c21e4988ac1f80f03ccdc84bccc12a6a4bff4a672690589756aeab12
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF SEO link farm. One of these links, 'https://ttraff.ru/pify?keyword=frecuencia+cardiaca+pediatria+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting the primary purpose is to direct users to malicious infrastructure. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=frecuencia+cardiaca+pediatria+pdf
    • http://files.westcroftcommunitycentre.co.uk/uploads/1/3/1/8/131856646/xaxujojijuxu.pdf
    • http://files.danaschechter.com/uploads/1/3/0/7/130740190/105696b0267.pdf
    • http://files.cochranetotaltree.com/uploads/1/3/1/4/131413718/bajazujixaxe.pdf
    • http://josifejol.luckyhensrescue.com/uploads/1/3/2/8/132814930/lujamegomewuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7272/3875/files/abolishment_of_slave_trade.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/dadifepowotosoruxejoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/29078164593.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/attestation_de_fin_de_formation.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/mitezaxojomekowojuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/kunuduziwipifadodixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/32172481104.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/93942180822.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/kejezavilatopawufux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/23896446157.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/5308407949.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/41410808115.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/77886554917.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/76956317421.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_off0000904c.bin
bca432ad35443c0ae2387159eb4884a96518cbae257ac41fa24d25559f87c6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x904C 4896 bytes
font_01_sfnt_off0000a107.bin
91dcdaf0f4f9748097645c37024f89ad0e4254955d93a0b959aab38d9c7da7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 11252 bytes