Malicious PDF — malware analysis report

Static analysis result for SHA-256 243de47230b60643…

MALICIOUS

PDF

37.2 KB Created: 2020-08-12 07:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b55c46c3048b7e9fbd3d15d2429f154 SHA-1: 3c7ace1505aedd41dcdc89256cb538eff2fa3c1d SHA-256: 243de47230b6064389e978055a4923f59a4973bdfc503acca6ba81a81097e3a8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=agramat+sau+anagramat+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=agramat+sau+anagramat+pdf
    • http://zodiki.holyfamily1699.org/uploads/1/3/1/6/131606490/jegewaxewanob_lurebod_sezobala_saribijo.pdf
    • http://files.calvary-christianschool.com/uploads/1/3/0/8/130813516/janari-lifuduxipokowek.pdf
    • http://bumunivi.kristincasaletto.com/uploads/1/3/1/4/131454106/782b7948e3a96d4.pdf
    • http://files.wakecomedicalalliance.com/uploads/1/3/2/6/132680822/domej.pdf
    • http://files.georgiafirstgen.org/uploads/1/3/1/6/131636725/235a9806041f06a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/19387152895.pdf
    • https://cdn.shopify.com/s/files/1/0435/3536/8346/files/10467884791.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/48008833787.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/wutodijis.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/20334142811.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/jack_lalanne_s_power_juicer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/three_billboards_outside_ebbing_missouri_script_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/1370/7688/files/57460377940.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tinoled.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/sawidezaxuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4509/files/arizona_ccw_permit_application.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/vofakomexipe.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_off00005379.bin
41a1a602d93c0b080350b67c5d67c308ebe9b310b4c916d50ef8fc4f7c9dac78
pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 5320 bytes
font_01_sfnt_off0000657c.bin
c03c4acc95d2a82ee8d13f87a4bfe12bea476620486a3ccbe56a02f61224acb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 10112 bytes