Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1a88e17464da0d…

MALICIOUS

PDF

42.2 KB Created: 2020-07-28 06:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298c5d88dcfa7efd07c2134c70081e3f SHA-1: 40080e785f5b30e70314b70b35726eb62876de91 SHA-256: fa1a88e17464da0d60b9641e69eb2722338121c600410e405a5d2e67ec51eb68
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'globo reporter 2019' and 'wkhtmltopdf', suggesting a lure. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, content.

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=assistir+globo+reporter+2019
    • http://files.rocktherun4mda.org/uploads/1/3/1/4/131453276/kulitifugivelapivozi.pdf
    • http://files.terijohnson.org/uploads/1/3/0/8/130873921/af344.pdf
    • http://files.floridaaquaticbiologists.org/uploads/1/3/1/3/131398250/6480983.pdf
    • http://files.rebeccanehringpainting.com/uploads/1/3/0/7/130776046/363b8e0b829aadc.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/66889516504.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/83631963706.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/folititozijirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/86341149014.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/fuxus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/gaturagipijolebegupet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/jamuwasuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/38884848647.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/buwigafotajajojorotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/japosuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0445/files/xerilobeguwasoxesasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/moxonomubelizanawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9150/9919/files/5252370062.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/56570201704.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_off0000684d.bin
8e3e7bc571ec7918c0178487aabae0fe06ca017d9c169f9a94a99142b8b529c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 5068 bytes
font_01_sfnt_off0000799d.bin
ffb515c4a680942fd8a1238e71007fd566499a085e3398e06e94300ec9a77a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799D 10048 bytes

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