Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a047e312988544c…

MALICIOUS

PDF

50.6 KB Created: 2020-09-02 05:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58596f32c38e0e538c73f2fab6dcfc25 SHA-1: db224310cf47396dab6c22a6021a97f9076dd4bf SHA-256: 8a047e312988544ce83fc9572838878149abdf533d49fa219f7206278cb5b8ff
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for SEO link farms and phishing. One critical heuristic identified a link to a known malicious redirector, specifically 'https://ttraff.me/wix?keyword=dividing+fractions+and+mixed+numbers+worksheet+calculator'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to potentially harmful content. The file was generated using wkhtmltopdf, indicating it was likely created programmatically to host these links.

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.me/wix?keyword=dividing+fractions+and+mixed+numbers+worksheet+calculator
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/zuverozof.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/what_hedge_funds_really_do.pdf
    • https://cdn.shopify.com/s/files/1/0434/1743/6327/files/a_level_sociology_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5833/9733/files/8th_grade_math_test_prep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/caresse_sur_l_ocean_piano.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/certificate_thumbprint_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/classification_of_protozoa_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/66046537075.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/craftsman_8_bench_grinder_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fundamentals_of_statistics_5th_edition_sullivan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9800/files/cestone_tavolino_flexform.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/pugazaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/ferromagnetismo_paramagnetismo_y_diamagnetismo.pdf
    • https://static.usrfiles.com/ugd/6dcf04_e6ca0c85a15c47fd95d348efc17752a0.pdf
    • https://static.usrfiles.com/ugd/097bd5_c47cb148cf434424a58a652e33f53666.pdf
    • https://static.usrfiles.com/ugd/08e331_557f892766cc49839fc84a1ff2b8df65.pdf
    • https://static.usrfiles.com/ugd/ac72e0_fb16bf089d1f47939e408972e636857c.pdf
    • https://static.usrfiles.com/ugd/5ed537_91a78e14221244229d15c49821e5c257.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_off000083d0.bin
45bfa26faa02a9beb6d013dc247091d23f6fa7a2b32882bcdfd87e7cfe501a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x83D0 5856 bytes
font_01_sfnt_off000097b9.bin
03ecc5a77670511619bfb54a062466f3e22b7b7aebb3b74bf28ebeadb11c2640
pdf-font-stream PDF embedded font (sfnt) at offset 0x97B9 10768 bytes