Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcb33b69a99d577…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 19:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4533eb7dff745e146f2d688b73400e8d SHA-1: 89a0ab31227a77f01a19d3a04408c51a0547bee0 SHA-256: 5fcb33b69a99d577e57e648bcd98c9d49aa5b6818078f130d11bad85f635a39f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign, aiming to direct users to potentially harmful sites.

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.ru/pify?keyword=broadside+array+and+endfire+array+pdf
    • http://files.celebelle.com/uploads/1/3/2/7/132712006/6270561.pdf
    • http://files.clairedaviselite.com/uploads/1/3/1/6/131637136/b72c8.pdf
    • http://ketajo.adventmoravianbethlehem.org/uploads/1/3/1/4/131407469/2565387.pdf
    • http://files.clcpeople.net/uploads/1/3/2/6/132696598/lorizarit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/45476016863.pdf
    • https://cdn.shopify.com/s/files/1/0430/1966/5561/files/20277695058.pdf
    • https://cdn.shopify.com/s/files/1/0435/9349/8787/files/magorugapumijonadu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/57071130606.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/zofran_davis_drug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/fade_with_braids.pdf
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/gmail_delete_old_emails.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/72236005034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/55240406970.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/tagufepokoruneni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/18962675064.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/47300487140.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/wafiparugodivalawetuz.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_off00006e3f.bin
6f1add7f3b756d4573e0e020e2181da75b774378fd8f50f8052611460eadb704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3F 5152 bytes
font_01_sfnt_off00007fe1.bin
bf3a1a950939b3503a8927edae332de65e4e0488fe55c05ef99b427ebfd7ae44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE1 10084 bytes

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