Malicious PDF — malware analysis report

Static analysis result for SHA-256 868a6ef24ad0dbad…

MALICIOUS

PDF

157.6 KB Created: 2020-08-11 20:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda48b76825ea0baee3867ce14ca81e0 SHA-1: d2757956e3e5cad8da5ff8e17eb3e1c09cba0467 SHA-256: 868a6ef24ad0dbada1b92b406c4e31512fd447d5f28c6a645a68151e93e7d617
92 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL that likely serves as the lure. The primary attack vector appears to be directing the user to malicious infrastructure via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=surah%20yunus%20bangla%20translation%20pdf
    • http://files.musictypographer.com/uploads/1/3/1/0/131070113/dopudeso-lamuxexazabafab-nalabodunubi.pdf
    • http://files.communityfarmersmarketbg.com/uploads/1/3/1/0/131070872/setiwezukusuz-puderojogibado.pdf
    • http://files.jackiesedlock.com/uploads/1/3/2/7/132740598/wagurewuvefudosufo.pdf
    • http://files.salon218dayspa.com/uploads/1/3/2/8/132814387/masuwedosog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/kingdoms_of_kalamar_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/wagomumosanejakufuduga.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/70178310109.pdf
    • https://cdn.shopify.com/s/files/1/0435/3422/1466/files/bayesian_statistics_an_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/sariwaxesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/xirogozupusutazesip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/kudatuloxadotakewavok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/20017216984.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/10707376989.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49181926903.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/6617639453.pdf
    • https://cdn.shopify.com/s/files/1/0437/6012/4065/files/67679314004.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
stream_006_off00022db1.bin
bf68c02219e2f548116ece8cb9e2c815e8d061f95e6a768273a66fd5eb347c01
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22DB1 33948 bytes
font_00_sfnt_off0001f691.bin
9522f23a7fc5db5c382f514af0ced65f16c3fbf9bc7951d255b84503637fa3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F691 5648 bytes
font_01_sfnt_off000209c2.bin
b777a36e5a0fcefb9cac2b07c752b23b7aa125b70aec2e3a15c9ca750a99e970
pdf-font-stream PDF embedded font (sfnt) at offset 0x209C2 10672 bytes