Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cdc8b37867a748…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 02:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e98203fa103f2933cfee0c12f99d111 SHA-1: fad88d2ba678745f67c37c30cc0537e0908c6309 SHA-256: a4cdc8b37867a748baa6e876b00768d1ceb5820da1dd61432fbd6cd8ae10f381
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic match for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body text, though partially garbled, includes keywords related to 'Steuererklärung' (tax declaration) and a URL that appears to be a lure. The presence of a large number of external PDF links, as flagged by PDF_SEO_LINK_FARM, suggests an attempt to distribute or obscure the malicious payload. 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.link/wix?keyword=steuererkl%25C3%25A4rung+anlage+e%25C3%25BCr+2018+pdf
    • https://static.usrfiles.com/ugd/a2c2bc_52f087895c4c4f3baa96dbc1a59e9765.pdf
    • https://static.usrfiles.com/ugd/87d215_db8225f8a6354d30b88d713eee9e3a03.pdf
    • https://static.usrfiles.com/ugd/e73fea_1bde957332e34018931655c6b4802f2c.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_30cd390c480c4ab4bd085a8bbff034be.pdf
    • https://static.usrfiles.com/ugd/2274a7_1a74331a9fd04c3284cdf41772502ad5.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/vaxuxodug.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/24075164498.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/45158470771.pdf
    • https://static.usrfiles.com/ugd/6da380_898c76e49a824f0fa19eca4e6e883853.pdf
    • https://static.usrfiles.com/ugd/2486b5_b5dbb2deff504d75b208d4f62399314f.pdf
    • https://static.usrfiles.com/ugd/008e52_f81068b9e7fc4a06af2948d9329add2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25449f8f3d245d2bead0c1867bef2d9.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/lopezizizejagixexisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4577/files/neil_cavuto_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/26962001953.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/47409508269.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_off00006770.bin
a1ab7a61c857fcd2c965e0c7a813e60ad8bdb77f54e4433373af6912b395284c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6770 6076 bytes
font_01_sfnt_off00007b69.bin
fe11d5d36bb46d709c40e82f50e056676b3164aa5ab601f988c6e9b2ebac4ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B69 10836 bytes

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