Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a46cef6819e49c…

MALICIOUS

PDF

60.2 KB Created: 2020-08-09 12:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ff8381b33f961ce5404206ef0fc690 SHA-1: b28b69cb2ef2208b6877797e7c64e119fa810382 SHA-256: 21a46cef6819e49c2f931a7eab299d1efdf79f03eda49be03aea3b6c629b3512
128 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, a technique often used for SEO poisoning or to direct users to malicious sites. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=subarachnoid+hemorrhage+pdf+2020', is flagged as a known malicious redirector. The document body contains garbled text but includes the same URL, suggesting it's the primary lure. No scripts were extracted from this sample.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=subarachnoid+hemorrhage+pdf+2020
    • http://files.alessiadana.com/uploads/1/3/2/7/132740606/dikalemojepemovimu.pdf
    • http://files.veganinstyle.co.uk/uploads/1/3/1/4/131483034/6942821.pdf
    • http://files.mixfitperformance.com/uploads/1/3/2/8/132815367/mukulaseb_bokaxarov_zuwud.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/snap_hack_no_survey.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/42840440501.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/47809563751.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/51641378752.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/73184942401.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/wazibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/osu_skin_pack.pdf
    • https://cdn.shopify.com/s/files/1/0452/7587/3442/files/cognitive_dissonance_festinger_1957.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/84284068366.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/fibemin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/nidoxal.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_off00009a82.bin
ae42b0c4b1c1c82cb67d8cd1274fdd4986d8acb3ceaa165d7fa97597311adfea
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A82 5680 bytes
font_01_sfnt_off0000ad93.bin
0cce86591bd7746b2525257f0febc49bbeb96366539b8ce9ce195534c2332a59
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 12420 bytes
font_02_sfnt_off0000d56a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 4324 bytes