Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f777710b786dc0…

MALICIOUS

PDF

39.1 KB Created: 2020-08-18 14:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4dabb1b2361af39eb86b56e6b953e5e SHA-1: d6c07bfd6af5653e3cec935a6408b0231f3cc957 SHA-256: 63f777710b786dc0ccf3657641663e0cfb621acae34cb83fa90baa21ad2a6aa2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, likely as part of a phishing or scam campaign. The document body text, while obfuscated, contains the target URL and references a 'worksheet key', suggesting a lure to trick users into clicking the malicious link. The presence of numerous PDF links further indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.cc/pify?keyword=finding+slope+from+a+graph+worksheet+key
    • http://files.nestmboston.com/uploads/1/3/1/3/131398177/vusogolexebozu-xivekizoxaxom-basisidexijum-gujas.pdf
    • http://files.scoilsantain.com/uploads/1/3/1/8/131857565/bexejibajumege.pdf
    • http://files.richmondcountylittleleague.com/uploads/1/3/0/7/130738870/ae131687d.pdf
    • http://suvuj.memphisescaperooms.com/uploads/1/3/1/8/131872096/nuwoxud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/majudafub.pdf
    • https://cdn.shopify.com/s/files/1/0437/8656/7841/files/54735209293.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/curl_data-_urlencode.pdf
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/75096841436.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/82109119984.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/archydro_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/babafuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/kraftmaid_cabinets_prices.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/39079725690.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/93309966340.pdf
    • https://cdn.shopify.com/s/files/1/0439/1770/5371/files/makalah_amdal_industri_terhadap_lingkungan.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/
    • https://cdn.shopify.com/s/files/1/0
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a62.bin
56fb9e3e296d5462e949e18f1cb930a4772ebd2fdcb5fad66f4aafca012d457d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 5668 bytes
font_01_sfnt_off00006d96.bin
5b8b7cd497efa52af28408b58a5c32df3f77a4881bcc9d453502d03e63f41c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 9952 bytes

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