Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a3a77ccc6b6eab…

MALICIOUS

PDF

47.8 KB Created: 2020-09-05 19:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211d7fcc4670bebcdf827c59165272b1 SHA-1: 0cec2025a3b22137333851f5b6404f17fa3ad4da SHA-256: b1a3a77ccc6b6eab2854f213979f3d16917887ed9e8b880db325b3ec26d964cb
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to "digital electronics mcqs with answers pdf" and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious infrastructure.

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=digital+electronics+mcqs+with+answers+pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7635/files/otite_moyenne_aigue_traitement.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/25849839325.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/bichagadu_movie_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/11960656254.pdf
    • https://static.usrfiles.com/ugd/dd6616_a16aada5dab04ee79a161a416aadf927.pdf
    • https://static.usrfiles.com/ugd/7198c1_8494f4399ab64b529d70d1e0ba709e04.pdf
    • https://static.usrfiles.com/ugd/9219f8_f0287dd3c58c4283a4d275c1e66f6f53.pdf
    • https://static.usrfiles.com/ugd/2ac701_3db45a7c1ecb426797c792222353edf4.pdf
    • https://static.usrfiles.com/ugd/b48b60_1ea46d4037cf48bb909d97145fd427d8.pdf
    • https://static.usrfiles.com/ugd/ef7b09_25c83391d95247969e226028d277d139.pdf
    • https://static.usrfiles.com/ugd/30e015_371b42215d1742c5b74808960cff66e0.pdf
    • https://static.usrfiles.com/ugd/fe83c3_66074dbe06134668ad5308dccf5c409b.pdf
    • https://cdn.shopify.com/s/files/1/0433/1307/0238/files/information_report_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/75066402896.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/27861850571.pdf
    • https://cdn.shopify.com/s/files/1/0435/9405/5843/files/soylent_weight_loss.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/broker_dealer_regulation_in_a_nutshell.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_off00007a4a.bin
6c274decbce7a70123a1d6ae3ab41b0d82cdceab49f7a6e82614ebac3d9dbfe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4A 5784 bytes
font_01_sfnt_off00008ddf.bin
03dc379fa6b050beabe34199321037d25623e124a2da55652e3ab77948f73c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDF 10728 bytes