Malicious PDF — malware analysis report

Static analysis result for SHA-256 23572bb87f9bd1bc…

MALICIOUS

PDF

52.2 KB Created: 2020-08-24 23:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad7ffb79ae360f4d874c300373a84bd1 SHA-1: c518bc97717ffee10c4c5283340470da48a19d42 SHA-256: 23572bb87f9bd1bc412b40848f2a3a13e750eb1ea123ebdef16ba25e555915c1
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL designed to appear as a Bittorrent speed increase tool. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bittorrent++speed+increase
    • http://wipetaxas.valkyriefineart.com/uploads/1/3/2/6/132695306/2b848e8e.pdf
    • http://files.springwoodbaptistchurch.org/uploads/1/3/0/8/130874180/ramosu-fezitemasuzabak-wefimubanejoxo-mipeb.pdf
    • http://junawez.stjca.org/uploads/1/3/0/8/130874575/6074476.pdf
    • http://files.rangeroverclubsa.com.au/uploads/1/3/2/3/132302764/334420.pdf
    • http://fenoko.pestcontrolbrampton.org/uploads/1/3/0/7/130739654/tulemigarusaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/introduction_to_business_glencoe_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3026/5511/files/gizegedij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/dazedonerivorup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/vazimaxidukugizo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/kugarezumaluvob.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/nuvajepik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/bartholin_abscess_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/document_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8150/files/bulojabetajejorepofif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/67110224132.pdf
    • https://cdn.shopify.com/s/files/1/0435/8085/0335/files/supupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/adobe_premiere_pro_cs4_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/falajaxonatuvok.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/ios_vs_android_meme.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_off00008886.bin
4e6a75b53d3aaf91e2aabceb84078022cbbc9daf332611902b5c27f1f98896b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8886 5084 bytes
font_01_sfnt_off000099d4.bin
961608d9e1a4e141524ae92b76f7319d0ed8ca72955c6e1b3f96fd1fa8518f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x99D4 13232 bytes