Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e41dce82d4164f…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 02:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de16c100975fe721fdfd9216ec1f174a SHA-1: b42b82ad704478bd3d0f52cce2b145c1ffbf4fd7 SHA-256: 56e41dce82d4164f7c028f075bb5d564161d869286b3b9ce070808ece482e13a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used in conjunction with the lure 'Oxford dictionary download english t'. This indicates a phishing or scam attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.com/wix?keyword=oxford+dictionary+download+english+t
    • https://cdn.shopify.com/s/files/1/0432/7384/6952/files/xuvivati.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/jusotedewuvunozebigun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/length_conversion_worksheets_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/bakuliwowekoxiwitepuluwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/epistaxis_recurrente_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/58238078768.pdf
    • https://cdn.shopify.com/s/files/1/0462/2637/4807/files/didevubavat.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/5002132095.pdf
    • https://cdn.shopify.com/s/files/1/0462/0048/8089/files/periodontal_disease_information_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/adobe_creator_mod_apk.pdf
    • https://static.usrfiles.com/ugd/ce14f3_6441c5e46218402b8392dcd6c7c365e8.pdf
    • https://static.usrfiles.com/ugd/2ddd39_7bdcf3484c01487aa842542f018a4dd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_2694293acdc94bc78151d85ae443748c.pdf
    • https://static.usrfiles.com/ugd/b5472a_4c1ec1bff74c498c89dfb146cb959c08.pdf
    • https://static.usrfiles.com/ugd/e4a001_e33ce31240c94c0b83f6c5bb7fa9a035.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_off000061bb.bin
ae6a44ee4d26e6043f6a0fff1b5185da3fd4fc4d8bf56fdd6b0edddcbe861e2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 5572 bytes
font_01_sfnt_off000074c9.bin
c2f91ad193054a5047739aac151bbeb1dd0b9189ee0670e8be672e012229d5c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 14316 bytes