Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c6126e765adf4…

MALICIOUS

PDF

49.5 KB Created: 2020-08-31 16:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9615b8601c5792eec33134ea331212f SHA-1: 9ba47c8ec4c06a4ea3f7ccce909f8359ba3a288f SHA-256: 4a8c6126e765adf4055947fb464b2dbc79a6357cce51c529598f9ed8485875ee
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=android+api+27+vs+26, which is also listed as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=android+api+27+vs+26
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_312ad0571ab1466f833c3adc3bb07fe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_51fe41c0722f429dbb50cc7821b345d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb335737a47b4a68aba77d7ba136fa2a.pdf
    • https://static.usrfiles.com/ugd/63d3ad_4afbd350e193487dbcf857ecad035ab1.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/synapxe_x_custom_ui_rc7.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/86070580803.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/40835715832.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/genodobegekedelixomoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2013/2257/files/sizow.pdf
    • https://cdn.shopify.com/s/files/1/0451/7625/8711/files/nibij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/cameraman_gangatho_rambabu_telugu_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/lectures_on_tung_s_acupuncture_points_study.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_off00007541.bin
b08111c19274afe689146455baf1857f9937151f5c1b508e6db2337a3eb3b7dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7541 4924 bytes
font_01_sfnt_off00008601.bin
6041bf15fc1d2d1277ae918182189210c1229f24300715b91fa04e5ce787ff32
pdf-font-stream PDF embedded font (sfnt) at offset 0x8601 11032 bytes
font_02_sfnt_off0000ab6d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6D 4324 bytes