Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249752db1fce5b9…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 19:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ebdb51b4e28e5c06a377da7e9c14e19 SHA-1: f9c1772c08f9ca6605057cc61719f79b14ee8e6b SHA-256: e249752db1fce5b910af105225ad9e66ba8abbf0c82b8fafe312860b054a34c4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of embedded links, many pointing to Shopify domains, likely to obscure the malicious destination. The document body text, though partially corrupted, contains the phrase '20. 6 faulty parallelism practice 2 answers', suggesting a lure to disguise the malicious links. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=20.+6+faulty+parallelism+practice+2+answers
    • http://files.cailenfu.com/uploads/1/3/1/4/131437444/rutez_wubusaxofab_kajali_zuwogor.pdf
    • http://files.fumckidsconnect.org/uploads/1/3/0/7/130739614/937b4f636a879.pdf
    • http://files.blonde-intelligence.com/uploads/1/3/0/7/130775727/jupugedikitiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/matimufafedimotepuron.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/megovoruz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/40601827333.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/silujokavivaredopipor.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/66341483010.pdf
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/26807989439.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/55206522781.pdf
    • https://cdn.shopify.com/s/files/1/0434/3188/6998/files/jinerebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8881/3988/files/pugikunesogupupetide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/7367643788.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_off000072e9.bin
386821387bf9166a46703aa780178a9137311857ad97f4609222d4c4d67fc2be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E9 5720 bytes
font_01_sfnt_off0000865f.bin
0267a88035c9e1fe2512c088e6499d18834a766243353bf40745d1fc3aa69886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 10200 bytes

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