Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab87b4697cd47ec7…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 22:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b9936e2040e311631c947b64059efe SHA-1: b7ff8bcde8b2423c6674f433fd69b4efbd4b186e SHA-256: ab87b4697cd47ec774ea907e55849c73a81f379e1d7ee4ca69907e41411639a3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes the malicious URL, suggesting an attempt to lure users to external sites. The presence of numerous Shopify-hosted PDF links further supports the 'link farm' heuristic, indicating a likely attempt to manipulate search engine results or distribute content through a compromised platform.

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.ru/pify?keyword=business+analytics+james+r+evans+pdf+download
    • http://files.loveyourbodyhc.com/uploads/1/3/2/6/132695633/e0b9781b26a71a3.pdf
    • http://files.umunano.org/uploads/1/3/2/7/132740692/buxorukubakab_timugibub_buwetikizop_jefab.pdf
    • http://files.melbourneorchestra.com/uploads/1/3/0/7/130775275/nesinoru.pdf
    • http://files.photographybydicklund.com/uploads/1/3/0/7/130775734/timopijarituve-sijajefepane.pdf
    • http://files.deborahbayan.com/uploads/1/3/2/3/132303083/xezukakabofezivezok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/78945821537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/19355022479.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/zideresovevifamamom.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/38608212456.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/kizubibijag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/42827976258.pdf
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/uninstall_razer_synapse_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/vatarodepukaren.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/sefawesipori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/gemosuwujogizikiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/zivobudopotajuxiwixujavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/77691159690.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_off00005423.bin
0dfade108bbc1b4d4b88ae0f23f1609a65c181fe79b5c54bda8b84f8ed42de55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 5564 bytes
font_01_sfnt_off0000670a.bin
2336c78c6efdea28f19771ff8d003f53ec5c1be95d2683cd0bb796f8c7d3bf8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670A 9980 bytes
font_02_sfnt_off00008919.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8919 4324 bytes

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