Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e2a43c21dd32e7…

MALICIOUS

PDF

34.2 KB Created: 2020-09-03 17:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1458ec9e43008467b6fa23db8d129f8b SHA-1: 46b2aaba7ab7e931dab1477d26a101e13adb5f3d SHA-256: 79e2a43c21dd32e7a8bffaab259be68d40a9a7b6c5786b61abb7ac597e3b5725
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector URL, identified as malicious. This redirector is part of a link farm, suggesting a spam or SEO poisoning campaign. The document body, though heavily obfuscated, contains the same malicious URL and references to 'beetalk application free', indicating a lure to trick users into clicking the link. 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=beetalk+application+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4561/5766/files/8264183826.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/pubg_mobile_lite_pc_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/19850404761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6016/files/1972_cutlass_supreme.pdf
    • https://static.usrfiles.com/ugd/96bf9d_7a4846651bbb40dbb696f945f94883a5.pdf
    • https://static.usrfiles.com/ugd/74e9cf_8ddd5d7788a24ebb92f3eb2c979dc168.pdf
    • https://static.usrfiles.com/ugd/6290de_d941d5a0e8b740be8f0b9de94b13d45c.pdf
    • https://cdn.shopify.com/s/files/1/0430/3277/2757/files/varenalimodewosaba.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/opportunity_analysis_canvas_third_edition.pdf
    • https://static.usrfiles.com/ugd/2f7815_5866dbcf63c74345bf7a5559bb246241.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d36f160296b48f5a4eb1185357e8ee0.pdf
    • https://static.usrfiles.com/ugd/67e251_e515b97909a048de94a506a9ba0626c7.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048b2.bin
8ad5697c814b95d678f1b68be89da82fc59e3b0a6f1b5c6dc69a0928ff1985db
pdf-font-stream PDF embedded font (sfnt) at offset 0x48B2 4944 bytes
font_01_sfnt_off00005998.bin
7dc302495819d5c8065f019ec817ed8b9b4a56dbadedeef7802205bbfbe52093
pdf-font-stream PDF embedded font (sfnt) at offset 0x5998 10128 bytes