Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a19c025ef5ba9f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 10:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5985a8a19b222cf74b1e4044712b13f0 SHA-1: d87d0582e0bb32e5dd980cd358c6d50a559005bb SHA-256: 49a19c025ef5ba9fb2792a82f4f1932db9d17de740859ff9c5125e9a8d020ae4
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary link directs to a malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily corrupted, contains text related to 'lower back pain physio exercises pdf' and the tool 'wkhtmltopdf', suggesting a social engineering lure to disguise the malicious redirection.

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=lower+back+pain+physio+exercises+pdf
    • http://files.ppscgc.com/uploads/1/3/0/9/130969655/7a74b25.pdf
    • http://files.noestansolos.org/uploads/1/3/2/8/132814900/jomizojiziporilisari.pdf
    • http://files.elementaryvalue.com/uploads/1/3/2/8/132816202/65cd9c1743e6.pdf
    • http://files.graphite-art.com/uploads/1/3/1/4/131437330/juseraxawuwik_pimelatufozekup_sanowexifimupa.pdf
    • http://files.beingwithcounsellinglondon.com/uploads/1/3/2/6/132682882/bavilad.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/kuzidipelitorexuzuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/66660806811.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/digubaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/4969668046.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/rule_34_knot.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/pibejinezep.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/61067126792.pdf
    • https://cdn.shopify.com/s/files/1/0434/2307/2412/files/dabatamesujagavufafipiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/bimutekoxowikapefewuzux.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_off0000627d.bin
7637f7ca9f4eefb86dda01b6ae5c94bf9c93923e7e028d91f52b457fed26fe87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627D 5616 bytes
font_01_sfnt_off000075ad.bin
882473f0434a9ff1a16c7fdcac2d8791b293f717227df998c02477634a64c3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AD 10028 bytes

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