Malicious PDF — malware analysis report

Static analysis result for SHA-256 537e817c37271b35…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 12:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27d2164cd01c12448f277be2a377d38 SHA-1: 60dadbf162d32b0a9d37d5c1530c7d45ce5be9b5 SHA-256: 537e817c37271b3574f36c76ea028d4ddbcc695c2a00279ee4bf1df1e92f0f11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.com/pify?keyword=amsterdam+sightseeing+map+pdf, which is likely used to redirect users to further malicious content. The ML classifier also 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=amsterdam+sightseeing+map+pdf
    • http://difeta.shorelineartists.net/uploads/1/3/2/7/132710797/kukomuwewakavegiva.pdf
    • http://files.rockinrobindjs.com/uploads/1/3/2/6/132681992/magojujukakowe.pdf
    • http://jomitam.amariejphotography.com/uploads/1/3/0/7/130775085/7ef991b823458fc.pdf
    • http://salulo.glitchedworks.com/uploads/1/3/2/8/132814930/6236858.pdf
    • http://files.jam5k.org/uploads/1/3/0/7/130739892/wixidunaleda_gutoxoroj_lozumad_fagizejiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3030/files/33282_blanche_lake_elsinore.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/bombastic_words_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5311/files/54152227953.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/cavatina_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/70977859051.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/osho_the_book_of_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4177/files/fajixumuravik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5251/4979/files/jagiliz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/67763971716.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/botewijepazisomodofejonaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/i2_analyst_notebook_9_user_guide.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_off00005a1b.bin
1621915f1f9a4e547322015ffb0f40f0c3f212aa0907eccba24c5fbe6f98736a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1B 5412 bytes
font_01_sfnt_off00006c5a.bin
96e659a665e073d345b1782514fddce03a1a891b0dcaaa43754611a5633fb345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 9844 bytes

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