Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4037f272754adff…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 17:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7cf85b0582df7b1b0431c1ff2e5e214 SHA-1: e7c106b4aa20f284584c73711cf44f8d09a91db7 SHA-256: f4037f272754adff496143e00f3c6b249ec0400b708b618374b17bd8d0bec252
152 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, including a critical redirector link to 'https://ttraff.cc/pify?keyword=acrobat+pdf+pro+free+download'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users to download software. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

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=acrobat+pdf+pro+free+download
    • http://files.jcschoirs.com/uploads/1/3/1/8/131858540/wonoweg_dizanod.pdf
    • http://files.amandaseddon.com/uploads/1/3/0/9/130969358/7de5e74f48f.pdf
    • http://files.thegrowingseedsoflove.org/uploads/1/3/1/4/131437513/8025698.pdf
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/gijezizapawarozereditijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/cagliari_mapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/fosefixujubebuji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/zisuvasoluterosidejima.pdf
    • https://cdn.shopify.com/s/files/1/0436/7728/6565/files/rugebunopanejis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9847/files/centos_6_network_config.pdf
    • https://cdn.shopify.com/s/files/1/0428/7257/0012/files/jade_nile_nude.pdf
    • https://cdn.shopify.com/s/files/1/0437/3331/9831/files/juzolaxenewupafon.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/pride_and_prejudice_oxford_bookworms.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/6542818119.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e9.bin
5d76b9f44c5bea5b7d7e65ac1742eb1eef2d0a0bedea1f2c6afd430590136af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 5236 bytes
font_01_sfnt_off00007654.bin
61a1203d89f546e802dcdd5eb6ab0b8b018b4a96b55fdec67d684678382f5759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7654 5192 bytes
font_02_sfnt_off00008821.bin
bce66ab70a392e7fc55112b7c201d5c78a90270f617a6e793a8bc7ccb4f36611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8821 10164 bytes
font_03_sfnt_off0000ab3b.bin
6a519f54f5516a02950eed31c222a33217e1daf964577f37e3b402c146ae77cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3B 16488 bytes

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