Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1a83fbbf3d696c…

MALICIOUS

PDF

42.4 KB Created: 2020-09-06 01:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78cc86906811542f6ef2d31b978a4f05 SHA-1: 5fe07e6457f85e4e7ffbb70916883b28303b4880 SHA-256: ac1a83fbbf3d696c1489c05e87a6dd96fab26571862649e2a72004451ec74946
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=daily+puzzle+answers+red+herring'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, some pointing to benign content but originating from a potentially malicious structure. The presence of a 'download button' heuristic further supports the lure-based attack pattern. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=daily+puzzle+answers+red+herring
    • https://static.usrfiles.com/ugd/b85eb0_a384493a2cc74266b47494f0cc0dba82.pdf
    • https://static.usrfiles.com/ugd/f34823_7f520e8026044562a217e90d1f91e824.pdf
    • https://static.usrfiles.com/ugd/5ecadc_733344c7adbc4c6080151e5417ac20e0.pdf
    • https://static.usrfiles.com/ugd/38eac1_3f68957052004c8697e9334746a54e2e.pdf
    • https://static.usrfiles.com/ugd/4bb894_22e04b94d6554d828a8838b6350bc5b8.pdf
    • https://static.usrfiles.com/ugd/575fb0_245fb03d53f84895aa8ef96ded78fac0.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/agenda_21_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/mofuribuwavuref.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/ordinal_numbers_in_words_1_100.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/approach_to_chest_pain.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/35405319203.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/7833200463.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/59458520141.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/29265863528.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/facies_del_pseudobulbar.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_off00005966.bin
994ef2cbd531e9ef38cb9f1b74e1d15a4708a9c56b354005c087e744cdc0bb0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5966 5156 bytes
font_01_sfnt_off00006af1.bin
0237ef3cdfbf10e119df4f76bf541e8909df8f2ac95af3b21a992e593df0eff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 10316 bytes
font_02_sfnt_off00008e41.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E41 4324 bytes