Malicious PDF — malware analysis report

Static analysis result for SHA-256 2228da0093e84d60…

MALICIOUS

PDF

49.6 KB Created: 2020-08-12 23:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39c40790adf27ae5d0bc85655a54c8d SHA-1: fce76e81c669316905cd1a4f92b2bc7c18cc2e13 SHA-256: 2228da0093e84d601b1a5e9b596af91c7bb74742e0c5572bcc19457fab4d34c4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm or SEO manipulation scheme, likely intended to lure users to malicious content or to improve search engine ranking for malicious sites. The presence of numerous external links, including one pointing to a known malicious redirector, suggests an attempt to distribute or mask malicious payloads.

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/wb?keyword=brooding%20chicks%20pdf
    • http://wojasa.chynajones.com/uploads/1/3/2/7/132710712/zumikagawewizikasuko.pdf
    • http://files.alchemyls.com/uploads/1/3/1/8/131856330/3a81265e.pdf
    • http://zikined.noradragoon.com/uploads/1/3/0/7/130775195/tuxisovo_laxebugefil_novebulexekiwun.pdf
    • http://sikof.yellowstonewritingproject.com/uploads/1/3/1/3/131381078/naduxo.pdf
    • http://files.mindfulvisionaries.com/uploads/1/3/1/4/131437308/91ac8cc36789.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/suwodekobugeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/dorure.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/tratamiento_absceso_periodontal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/15272633370.pdf
    • https://cdn.shopify.com/s/files/1/0440/1748/3934/files/21096644455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bepojarovizezeba.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0498/files/jogawageginuteditoburan.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/audiometria_tonal_liminar.pdf
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/pimab.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/nizaruwodubiraxarezij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/tonov.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_off0000786b.bin
5251a423dc6284635ffc4d18b916b569c175b0050e6c684e2b70b2f6c3bbb7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 4876 bytes
font_01_sfnt_off000088ea.bin
e0c000f24a3771082b567d173d992183ee84a88e078ab4a7a7327dbbc003e9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EA 9988 bytes
font_02_sfnt_off0000ab10.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB10 4324 bytes

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