Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ec7c4610b593b5…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbfc570732757a8d68473363da9f4a7 SHA-1: 1fd6af8846de1585200a5232cdddb22546aef554 SHA-256: 28ec7c4610b593b5d5a257d5e3f6aad34b3efac695b940dee35091bef72e2c42
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=gratis+youtube+naar+MPEG+2+converter'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also contains a mass external PDF link farm, indicating a potential SEO poisoning or spamming campaign. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=gratis+youtube+naar+MPEG+2+converter
    • https://cdn.shopify.com/s/files/1/0430/1586/4473/files/ring_of_blades_ds2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/academic_writing_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/zetobi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/reduce_file_size_online_to_100kb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/doris_lessing_las_carceles_que_elegimos.pdf
    • https://cdn.shopify.com/s/files/1/0436/4769/7049/files/32444563089.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/easy_learning_chinese_characters.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/xanenen.pdf
    • https://static.usrfiles.com/ugd/b8c837_1796ddaa77c143c68fd607b0def975dc.pdf
    • https://static.usrfiles.com/ugd/c7a620_cf9df783d2df4de48cc2a9d5d826d796.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c283542dd054f8287c4545160b60715.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/
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4d.bin
aadefa5a87deb43e77560eb8073706139193a3dd1ec4d9229229ce7acb15ce23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4D 5472 bytes
font_01_sfnt_off00007f1a.bin
32a3337d61642797cbc4171366c0c016bf669ff4e96da017dc8ce68a0f2032c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 9980 bytes