Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f98a865be58b0e1…

MALICIOUS

PDF

50.7 KB Created: 2020-08-30 12:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd22627b579e3dd45a42c7eed113b603 SHA-1: dfa579eab9e0effd614dd401f66f94cf272083b5 SHA-256: 0f98a865be58b0e1d6ed6dd3e44caccd4b51452778712754ac820cb81fc8eeae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=most+common+themes+in+literature
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/cascading_style_sheets_outlook_2016.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/pumadir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/pawn_shop_19th_ave_and_bell.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/apache_hadoop_administration_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_f84d2f88bed544ebb462f78212e9dd0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_928da8534db641c1a63a7a9cb8334c3c.pdf
    • https://static.usrfiles.com/ugd/b0b521_0a0ba695adf7444dae168a42b652ccf5.pdf
    • https://static.usrfiles.com/ugd/96768c_6f2c600cbe3449bd950c0734f0b59e24.pdf
    • https://static.usrfiles.com/ugd/6290de_776fc0042c5c404193113467e9fe896e.pdf
    • https://cdn.shopify.com/s/files/1/0429/3980/9959/files/sajabosenig.pdf
    • https://cdn.shopify.com/s/files/1/0466/5144/1317/files/decomposition_of_sodium_chlorate_post_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/expectation_to_the_company_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/risukesekemunobobekow.pdf
    • https://static.usrfiles.com/ugd/b6edda_d5dd2f46f4124ddc90ccae98ed7371db.pdf
    • https://static.usrfiles.com/ugd/d2751c_d396e2acf85746579ba0a4996efe0e4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_535adc7e34784ebeb158f3075977bb95.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ea82feab48846e2affe08e1fd49485a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084e1.bin
45ba1b5923b173f5f8e33565fcd7e0f640852604abc1ba59b64dc3ddf969dd4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 5044 bytes
font_01_sfnt_off000095d5.bin
2aa5831aaec7fc1207949eaed8a4c6adc05653548e9cc4d6f26ed3b64e8e9da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 12128 bytes

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