Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5e18f7f0f8f832…

MALICIOUS

PDF

35.3 KB Created: 2020-08-22 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb8550d4fe3391486a92feef6817d11f SHA-1: ddbc8c9116bf498697f166dfb8b2df0717f50a1d SHA-256: 4d5e18f7f0f8f83268b3b590741eaac4d6ea47889f01fd3093d707c118e54fac
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=connectives+worksheet+ks4+english', suggesting a lure to a malicious site. Another heuristic identified a link farm of external PDF links, with 'https://cdn.shopify.com/s/files/1/0435/8301/3023/files/pontiac_head_code.pdf' being the first listed. 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/pify?keyword=connectives+worksheet+ks4+english
    • http://lizalal.rachelhenson.com/uploads/1/3/1/4/131453960/wimupibixozotet.pdf
    • http://files.texaslonestarleather.com/uploads/1/3/0/9/130969658/banok-zilovonopej-lexasofage.pdf
    • http://files.valorweek.org/uploads/1/3/1/4/131437864/depefatumagonig.pdf
    • http://begawum.champagnesparkle.com/uploads/1/3/0/7/130775429/adfb867.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/pontiac_head_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/88287961347.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/jukozubakodarizafire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/types_of_adjectives_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/alphabet_inc_annual_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/zibunupadosulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1743/6327/files/17885258689.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/psychological_disorders_symptoms_and_treatments.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/42151019219.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_off00004cb4.bin
9f27e3cf3ca99c3125067fe503cbde7656449807f1e73aa8e391e5f79de6de54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB4 5060 bytes
font_01_sfnt_off00005e02.bin
b71c2872b3c1b750ca536dc09ac61100496eed7f699d2a7e5a2f00fc860a2a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 10100 bytes

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