Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ee37a7a060fb07…

MALICIOUS

PDF

58.6 KB Created: 2020-09-02 06:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46013191a6bc69a1d5db9dd3b814327 SHA-1: b51bc217741fd580f1354fb849f08e5940613bcd SHA-256: 85ee37a7a060fb07f4df964ee136e7ae1d33cb6c3a00da9dea9131f217982ec0
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an Android OS update schedule, aiming to lure users to a malicious site. The document body and heuristics confirm the presence of this malicious link and a large number of other PDF links, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=android+os+update+schedule
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/45321774538.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/bcsh_guidelines_heparin_induced_thrombocytopenia.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/kadakif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/33586839866.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2181/files/pdf_to_word_app_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/jasolipefanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/40164537768.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7927/files/berliner_platz_3_neu_vk.pdf
    • https://static.usrfiles.com/ugd/fd3290_ae580ae14a774f3cb7ccc2ab996325c8.pdf
    • https://static.usrfiles.com/ugd/40512e_319ef81fe2c9430b9180cb182b588f4a.pdf
    • https://static.usrfiles.com/ugd/0dd040_d11d4a745cf646438416c5011b3bbfce.pdf
    • https://static.usrfiles.com/ugd/04e6f9_0b2764d3d6cd40188bffeeccb0d339fe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/freddie_mac_rate_term_refinance_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/11706350557.pdf
    • https://cdn.shopify.com/s/files/1/0437/0166/5960/files/drishti_current_affairs_in_english_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/36440475394.pdf
    • https://cdn.shopify.com/s/files/1/0437/7840/8599/files/47857588171.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_off0000a8b7.bin
d37d384a0d8d0f3f78336c2c6092304d233680d9f374c43e54cc9068cd2a55ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B7 5152 bytes
font_01_sfnt_off0000ba39.bin
e2fa97050bc300f8ad124ec025af726ff1e65048dc39419dc094a52d50c082cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 10364 bytes

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