Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e1df3afab1892f…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 06:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d8e5ccbf37f496c5622c26308bee9ab SHA-1: b929e03600d6ca893f186e4aeb50b56c554dd39b SHA-256: 36e1df3afab1892fce6193e9e8760bf9a12076c21001f92330018ae9bdabcaf5
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of a link to a known malicious redirector. It also contains a large number of embedded links, suggesting an SEO manipulation or link farm tactic. The document body contains the malicious URL and several benign-looking PDF links, likely part of the SEO strategy. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/pify?keyword=fantaisie+impromptu+sheet+music+imslp
    • https://static.usrfiles.com/ugd/451461_df1875679ac74107b9df23d7b2689b22.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a60f4f1975640dfb9fb79f334aec1fd.pdf
    • https://static.usrfiles.com/ugd/6cf392_a86818077e6445d595841e68ba0464da.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a1a1ea9071436fa46061a6bd567d35.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2269/files/duwofejaxuwug.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/chaconne_bach_violin.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/farolagopakomonulixure.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/wibusazanu.pdf
    • https://cdn.shopify.com/s/files/1/0448/4258/2176/files/hospital_waste_management_in_ethiopia.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/ews_certificate_gujarat.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/momosikikemisizilavaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/jewixagenudulibo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/convert_kilos_to_pounds.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/zubatonasusina.pdf
    • https://cdn.shopify.com/s/files/1/0452/1220/5216/files/xugidekujezeriwobovokisub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/exercise_routine_for_weight_loss.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_off00006439.bin
4c86cd35adfcb6e902f4f65fffa1f9f1d4b73673da432465e64e6f1b28f48c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5128 bytes
font_01_sfnt_off0000757f.bin
456fb8d86db118ffb6a88749ce0a2a6206e19a211a394902109884c148ce2e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 10592 bytes