Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ca0315bdb8c112…

MALICIOUS

PDF

51.8 KB Created: 2020-08-14 22:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e99ff739b3328be794187a91863c19 SHA-1: 2158b1a56aef99475a10bf0e12d7f47762dce3da SHA-256: 23ca0315bdb8c11264b9bb0172d1f010aae77263adacb2467fd713afac8eded9
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a lure for downloading 'whatsapp gold mod apk free'. This is further supported by numerous embedded links pointing to various PDF files hosted on external domains, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

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/pify?keyword=whatsapp+gold+mod+apk+free
    • http://files.teapup.com/uploads/1/3/1/4/131437242/716758483705afd.pdf
    • http://texewife.orderyourbluebook.com/uploads/1/3/2/6/132696212/287138.pdf
    • http://files.heartandvineapothecary.com/uploads/1/3/2/6/132682655/3ba6b7ae.pdf
    • http://files.univ.ency-education.com/uploads/1/3/1/8/131872021/panugofowaz.pdf
    • http://files.authorkayshanee.com/uploads/1/3/1/0/131069887/d597f107ad3b.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/vawonavagutubajet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4114/3454/files/calligraphy_alphabet_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/fuxoresajasifubetegilub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0951/files/50607979650.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/plumbing_fixtures_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/beading_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/ratewisosadixujenidibifo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/20216177075.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5812/files/section_4._2_alternative_energy_resources.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8526/files/sacred_contracts_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/64162717087.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/64706994390.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_off000076ae.bin
1296ffcfb41324aca404d665de056a6f366d3e97147f6f27553e605f335df591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AE 5532 bytes
font_01_sfnt_off00008969.bin
5ad4bd9ed9166c483fa72b3780af75089d07b30f2f10ec0869eaea6af4e85506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8969 10112 bytes
font_02_sfnt_off0000ac43.bin
eae6c158afd6831860994e0f4a04e5ff23f8a3a83e35e0c7f2999725282ea046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC43 16208 bytes

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