Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b858811819a9540…

MALICIOUS

PDF

45.5 KB Created: 2020-08-23 23:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13da96c85d023ddeaaf0e65325dddd5b SHA-1: a5cac61990c8471a7e9525bffd9fe765867ddbf9 SHA-256: 1b858811819a9540792ce89168ad011304b5dc75d203ea5cb3013b2633b029ba
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing a large number of embedded URLs pointing to various PDF documents. One of the primary URLs, 'https://ttraff.ru/pify?keyword=bleacher+report+nba+standings+predictions', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL. The presence of numerous links, including one to a known malicious redirector, suggests an attempt to distribute malicious content or manipulate search engine results.

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=bleacher+report+nba+standings+predictions
    • http://sasufo.helpurchild.net/uploads/1/3/1/6/131606271/gufoxufu_romugiv_tizitazejodup_fokoxaso.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/insight_ias_monthly_current_affairs_april_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/talafoxusawixenubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/16293053578.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/76169963891.pdf
    • https://cdn.shopify.com/s/files/1/0439/7809/6798/files/rorosifalij.pdf
    • https://cdn.shopify.com/s/files/1/0435/0964/5478/files/67946713983.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/64908066248.pdf
    • https://cdn.shopify.com/s/files/1/0429/9020/7139/files/45507796206.pdf
    • https://cdn.shopify.com/s/files/1/0428/7502/7619/files/oxford_discover_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/92069246358.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/grade_12_general_chemistry_curriculum_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/dejuzexafamavinuvaxirinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7110/files/clicker_heroes_hacked_unblocked_at_school.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_off00006626.bin
1fd481d370125aa15d4d7b068690fe568710a602be53e64f8d55a603193ea69a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 5312 bytes
font_01_sfnt_off00007818.bin
4978a3fa395c4678983181f49bb32bf2e2d2927677392166f1d0bc8db0c934aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7818 10216 bytes
font_02_sfnt_off00009b21.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B21 4324 bytes

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