Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9533b89128b061…

MALICIOUS

PDF

50.1 KB Created: 2020-08-29 08:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046b892e981b07f228335b98cc37346b SHA-1: f582ebe19aa85300fcb27913ddc958966f5cd5cb SHA-256: da9533b89128b06151653e3c08021e0995d15bdea0ded333e0b5688bf05762c0
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL. This suggests a link farm or SEO poisoning attack designed to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=fooling+some+of+the+people+all+of+the+time+pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/accelerometer_applications.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/alora_orientation.pdf
    • https://cdn.shopify.com/s/files/1/0435/8805/9293/files/identities_trig_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/fojajulememaponupexubup.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/93750002274.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/the_bible_the_book_of_job_summary.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/aswb_masters_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/fonemitofadavovox.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/stopniowanie_przymiotnikw_angielski_wiczenia_dla_dzieci.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecbae893454846a49b35a5d79251e6c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.pdf
    • https://static.usrfiles.com/ugd/b8c837_29f53c28561d4bb1a99562316b0557f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_295504e368084fa4823ef55b4eb52df5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbeb29bb667241e7a20b3e45f37606ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1013032ceb64be4bed88212d48d2b18.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_off000077a2.bin
fc3175d66b507ae7e5186091688694e9a28fbbce4977467fc977127c54ffa876
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 5100 bytes
font_01_sfnt_off000088d0.bin
86c0a6fa835ebff36fb86c1c1fdaa41eeefbb9d1d92987b742c09e5329603087
pdf-font-stream PDF embedded font (sfnt) at offset 0x88D0 10956 bytes
font_02_sfnt_off0000ad42.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD42 4324 bytes