Malicious PDF — malware analysis report

Static analysis result for SHA-256 b912f0d147ebac51…

MALICIOUS

PDF

37.6 KB Created: 2020-08-09 00:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd7ae0aafe8bc8b3ff6ead24ee394c79 SHA-1: 561e454b8f0f8ff790b18415c0fc384aec587eac SHA-256: b912f0d147ebac51203c40a5e518b74c39803907ce9f8ece4dcd8476e3b7a162
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link redirects through a malicious domain, ttraff.cc, which is known to host redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF downloads and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=calculus+of+variation+by+a+s+gupta+pdf
    • http://files.gnv-daerligen.ch/uploads/1/3/0/8/130814774/dezadaselowu.pdf
    • http://files.lindsay-hamilton.com/uploads/1/3/1/4/131408899/visagemoram-dagogamawe-gumejosujejok.pdf
    • http://files.studioplumpiano.com/uploads/1/3/1/3/131383497/70178f76b.pdf
    • http://files.agency360sf.com/uploads/1/3/1/4/131437889/7997441.pdf
    • http://files.mcnairy.com/uploads/1/3/1/3/131383747/ladopa-munil-fiwewipuxi-dunufepokalet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/cormen_for_design_analysis_and_algorithm_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/4278/0837/files/bovine_mastitis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/sevemizazodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/92859714914.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0448/6601/1298/files/anabaptist_movement.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/85239126416.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/vosowisaduwidodele.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/zelda_ocarina_of_time_walkthrough_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/ziropoferizotupa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2140/0226/files/change_text_box_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.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_off000053cd.bin
7707d5d649df47aaca3a17f52e3ffde85c171464d853da5378171f0eb0442312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CD 5528 bytes
font_01_sfnt_off000066af.bin
6bd58b4f19f91644f1abbf9db091faf64853fead350ed0be6ca1ce1b55e4b6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AF 10096 bytes

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