Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48e71401d8edc73…

MALICIOUS

PDF

43.3 KB Created: 2020-08-05 11:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60d5f7cfce70f1a876a94f9322b17dfc SHA-1: 6498db6f8d92eb31a1637b19b7525f9aea1cb95b SHA-256: c48e71401d8edc735ec6b916d4d02fc001e9b1730a0944ac3a17512dd01e686a
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary redirector URL is 'https://ttraff.cc/pify?keyword=hsc+biology+textbook+pdf+download', which is designed to lure users into downloading content under the guise of a free textbook. The document body, though heavily obfuscated, contains references to the textbook download lure and the tool used to generate the PDF.

Heuristics 3

  • 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.
  • 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=hsc+biology+textbook+pdf+download
    • http://fazifuvu.steadfasttattoostudio.com/uploads/1/3/0/7/130739826/48976370.pdf
    • http://kexekula.fredericpissarrousa.com/uploads/1/3/1/8/131856161/7078693.pdf
    • http://files.myerk.org/uploads/1/3/0/9/130969889/debuvinoxod_nekota_lumeka.pdf
    • http://files.jilldfitness.com/uploads/1/3/1/4/131437515/56a73a7724ff1.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/33399738059.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/18433745780.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/26358240915.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/24418797365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/fisefurejosazasedumuneji.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/nivem.pdf
    • https://cdn.shopify.com/s/files/1/0446/0858/5891/files/how_to_know_higher_worlds.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/pixifejunetokerizalupaluj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6149/files/bokeretakedosuzirenaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/bolarotuzos.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/48364343643.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_off00006ab5.bin
25a584772b7c3e7411ba30ea06bf5f0347cb3ef736d81963efc74846e6eef395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB5 5652 bytes
font_01_sfnt_off00007e27.bin
1978b78ccf22895508ba909237654904a9c48678cdd6addd2ead2a92cfebf967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E27 9964 bytes

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