Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b0073d5e825f56…

MALICIOUS

PDF

51.2 KB Created: 2020-08-10 04:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c21d503abd66b310df514cd21f1d55 SHA-1: 36e8898e6fb3f4a5fcbf3f1e35f773c93c6605aa SHA-256: 48b0073d5e825f56ca2732be9039b0d19cecd38161807180616acb92900ef78c
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'regression analysis by example book pdf' and the malicious URL itself, suggesting a lure to download a document. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is designed to lead users to further malicious content.

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.cc/pify?keyword=regression+analysis+by+example+book+pdf
    • http://files.feenysphoto.com/uploads/1/3/1/3/131380000/6712175.pdf
    • http://files.holidayapartments-berlin.com/uploads/1/3/0/7/130776661/xurotiwizavi.pdf
    • http://files.valleyautoservice.net/uploads/1/3/1/3/131379406/towimu_bezezenelojoti_jaxowarifozivep_sewose.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/94080696670.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6039/files/70448724781.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/49076673051.pdf
    • https://cdn.shopify.com/s/files/1/0428/8947/8307/files/85431314071.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/29881376432.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/rectification_of_errors_in_accounting_for_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/8239/9390/files/99167906054.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/82210217974.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/oral_lichen_planus_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/3390/1726/files/55947773298.pdf
    • https://cdn.shopify.com/s/files/1/0438/5731/3957/files/back_exercises_for_sciatica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ab.bin
6cc221997cd5cea850eaecd18a61c1e6e96aa372f52f609ecc77fdb4984b06ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 5740 bytes
font_01_sfnt_off00007636.bin
e04dfa6d6b116bd2cc30d3bfe1b0fb9667b00d8649b0f0f9be6792a1604bda88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7636 14692 bytes
font_02_sfnt_off0000a46f.bin
4eae1d551626284c15b2fa418e3b93be944e0b57d990163973596a7b2d62aa99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA46F 17528 bytes

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